The dual journey: The development of twins' relationships throughout childhood.

Twin bonds, likely the most enduring of human relationships, provide both solace and rivalry for twins. Using an evolutionary psychology perspective, this chapter scrutinizes twins' bonds from prenatal stages to childhood to better understand their unique relationships. Twins' interactions, which begin in the womb, establish patterns of cooperation and competition. The initial years pose parenting challenges that shape the twins' experiences of dependency and rivalry. As twins grow, five dimensions-closeness, dependence, conflict, rivalry, and dominance-emerge, evolving distinctly between monozygotic twins (MZ: sharing close to 100% of their genes) and dizygotic twins (DZ: sharing on average 50% of their genetic variance). The chapter notes the closer relationship MZ twins share compared to DZ twins. While the closeness and dependence among DZ twins decline throughout childhood, these elements remain stable in MZ twins. The effect of zygosity on conflict and rivalry is less clear. For both MZ and DZ twins, conflict stays steady, while rivalry intensifies with school entry, probably driven by external comparisons, but lessens as twins develop into late childhood. Unlike singletons, where birth order dictates dominance dynamics, in twins, this dynamic is more variable and becomes more defined by around 6.5 years of age. Several factors are presented as impacting the nature of the twins' relationships: the evolvement of 'twin language', the parenting style and the differential parenting they receive. This exploration into the development of twins' relationships underlines the importance of tailored caregiving and invites further research into the genetic and environmental factors that shape close bonds.

Commentary: Assortative parenting and assortative cross-parenting: New views of parental preference for selected children.

The commentary delves into the implications of "assortative parenting" and "assortative cross-parenting," as introduced by N. L. Segal, and situates these concepts within the framework of current research. It addresses the joys and complexities of raising twins, highlighting how their concurrent development stages can amplify parental favoritism and heighten the challenge of addressing each twin's unique needs. This interplay provides a rich context to investigate assortative parenting practices. Additionally, this paper contemplates the broader picture of twin studies, particularly how the care of monozygotic twins (who share 100 % of their genes) and dizygotic twins (who share 50 % of their genes, on average) may reveal the intertwined nature of genetics and environment in parenting strategies. It also proposes that twins' interactions with other family members, their spouses, and peers can offer profound insights into the phenomena of phenotypic assortative affiliation, enriching our understanding of close relational bonds.

Hebrew validation of the postpartum bonding questionnaire: a study of mothers and fathers.

OBJECTIVE: The Postpartum Bonding Questionnaire (PBQ) is a self-report questionnaire designed to screen disorders of the mother-infant relationship. The PBQ was adapted to several countries, though there is no agreement on the accepted number of items and factors. This study aimed to assess the validity and reliability of the Hebrew version for both mothers and fathers. METHODS: Participants (602 mothers and 144 fathers) from two separate samples were randomly recruited in the maternity ward of a large tertiary health centre. The mothers' samples were combined and redivided to form subsamples A and B. At T1 (1-4 days postpartum), the participants completed demographic questionnaire in person the PBQ and the Edinburgh Postpartum Depression Scale (EPDS) were administered online at T2 (8-12 weeks postpartum). The PBQ was also administrated at T3 (six-months). RESULTS: EFA on subsample A resulted in a two-factor structure, which was tested using CFA on subsample B. The model's fit was very good; χ(35)2 = 83.68, p < .001, CFI = .97, TLI = .91, RMSEA = .07, SRMR = .03. Additional reliability and validity analyses showed a very good fit for mothers. Scalar measurement invariance across mothers and fathers yielded satisfactory results. CFA among fathers, revealed adequate goodness of fit; χ2/df = 87.65/46, p < .001, CFI = .95, TLI = .89, RMSEA = .08, SRMR = .05. CONCLUSIONS: The Hebrew version of the PBQ demonstrated satisfactory validity for both mothers and fathers. The revised version, with 14 items, measures bonding as a continuum rather than measuring bonding disorders like the original version. These findings emphasise the importance of validating the scale in different cultural contexts.

Mental health among children with long COVID during the COVID-19 pandemic.

A growing number of studies report that persons of all ages, infected with SARS-CoV-2, may experience long-term persistent symptoms, known as long COVID (LC) or post COVID-19 condition. This is one of the first studies examining the consequences of LC on children's mental health. In this case-control study, we compared select mental health aspects of 103 children diagnosed with LC to a control group of 113 children uninfected with SARS-COV-2; all 4-18 years old. Both groups were assessed via parents' questionnaires. In comparison to the control group, children with LC exhibited more memory difficulties. However, no group differences emerged in other functional aspects (connection with friends and engagement in physical activities), problems with concentration, or levels of emotional-behavioral problems (externalizing, internalizing, ADHD, and PTSD symptoms). We also found that children with LC had greater exposure to COVID-19-related stressors. Higher levels of parental worries regarding their children's functioning and economic difficulties at home significantly predicted higher levels of children's emotional-behavioral problems and were better predictors than the child's age, social functioning, or LC diagnosis.    Conclusion: LC was associated with impairments in some aspects of children's memory which may relate to academic functioning, but not with higher rates of emotional-behavioral problems, thus warranting interventional programs addressing school functioning and cognitive abilities in this population. Additionally, parents' economic stress and worries regarding their child's emotional adjustment during the pandemic, are important factors affecting pandemic-related emotional-behavioral problems among children, regardless of COVID-19 infection, that should be addressed. What is Known: • Children may have long COVID (LC) after being infected with SARS-COV-2. What is New: • LC may be associated to impairments in some aspects of children's memory, as reported by parents. • Parents' economic stress and worries concerning their children's emotional adjustment during the pandemic are associated with more distress in their children.

Atypical anorexia nervosa: Rethinking the association between target weight and rehospitalization.

OBJECTIVE: Bodyweight restoration is one of the most important targets in adolescent inpatient treatment of anorexia nervosa (AN). This study examined the association between achieving target weight and rehospitalization in two groups of adolescents with AN and atypical anorexia nervosa (AAN) admitted to a specialized inpatient unit. METHOD: Included were 202 adolescent patients hospitalized in a specialized eating disorder unit, 10-18 years old. One hundred fifty-four adolescents were diagnosed with AN, and 48 with AAN. We examined the patients' demographic and clinical characteristics, the achievement of treatment goals, and their rehospitalization history within a year of discharge from the unit. RESULTS: Log-linear regression indicated a significant association between achieving target weight during the inpatient program and rehospitalization at one-year follow-up in the AN group; this association was not significant in the AAN group. DISCUSSION: This study emphasizes the importance of differentiating patients with AAN from those with classical AN. Specifically, it raises questions about the predictive power of target weight at discharge in preventing relapse and its centrality in determining AAN patients' treatment plans.

Serum ß-HCG Level in Women Diagnosed as Having Retained Products Of Conception: A Prospective Cohort Study.

STUDY OBJECTIVE: Retained products of conception (RPOC) may occur after delivery or abortion, often necessitating operative hysteroscopy for their removal. A preoperative diagnosis of RPOC by ultrasonography is not always accurate and may lead to unnecessary surgical procedures. We sought to evaluate whether serum level of ß-human chorionic gonadotropin (ß-HCG) may aid in the preoperative diagnosis of RPOC. DESIGN: A prospective cohort study. SETTING: Gynecology department in a university affiliated medical center. PATIENTS: Women undergoing operative hysteroscopy for removal of RPOC between December 2019 and January 2021. INTERVENTIONS: Operative hysteroscopy for RPOC removal. Serum ß-HCG levels were obtained on the day of surgery, and level ≥5.0 mIU/mL was considered positive. All operative specimens were evaluated by pathology for the presence of trophoblastic tissue. MEASUREMENTS AND MAIN RESULTS: Of the 105 women recruited to the study, the operative pathology showed trophoblastic tissue in 81 cases (77.1%), and they were included in the data analysis. The ß-HCG level was positive in 16 of those 81 cases (19.8%). Positive ß-HCG level was significantly associated with RPOC after an abortion (surgical or medical) compared with RPOC after delivery. In addition, the mean RPOC mass was larger in the ß-HCG-positive group than the ß-HCG-negative group (29.1 ± 9.5 mm vs 23.8 ± 8.9 mm, respectively, p = .004), and the interval from termination of pregnancy to surgery was shorter (4.8 ± 1.7 weeks vs 7.5 ± 2.1 weeks, respectively, p <.001). Relatively high ß-HCG level (352 mIU/mL and 3561 mIU/mL) were found in 2 cases in which the RPOC mass was implanted on a previous cesarean section scar. CONCLUSION: ß-HCG level is noncontributory to the preoperative diagnosis of RPOC.