Growth pattern of selected urban Chilean infants during exclusive breast-feeding.

This report describes the growth pattern of healthy, low middle and low socioeconomic class Chilean infants during exclusive breast-feeding. Two-hundred forty-two infants who were on exclusive breast-feeding at day 30 postpartum entered the study. Of these, 59% were fully nursing at 6 months and grew at a normal rate without receiving either supplementary milk or nondairy food. Supplementary feedings were administered in 27% of cases because of suspected primary inadequate milk output and in 14% of cases for other reasons such as pregnancy, illness, maternal work, or self-prescription. Full nursing provided the highest rate of weight increase during the first 3 months of life and a greater weight gain for boys than for girls up to the age of 6 months. Gastrointestinal pathology, malnourishment, or hospitalization were rare events in this population. It is concluded that maternal milk alone, if produced in sufficient amounts, can maintain normal growth up to the 6th month of life. The study supports the choice of exclusive breast-feeding on demand plus child growth monitoring up to 6 months over routine prescription of supplements at earlier times particularly where supplement administration fails to meet individual requirements.

PIP: This report describes the growth pattern of healthy, low middle and low socioeconomic class Chilean infants during exclusive breastfeeding. 242 infants who were on exclusive breastfeeding at day 30 postpartum entered the study. Of these, 59% were fully nursing at 6 months and grew at a normal rate without receiving either supplementary milk or nondairy food. Supplementary feedings were administered in 27% of the cases because of suspected primary inadequate milk output and in 14% of cases for other reasons such as pregnancy, illness, maternal work, or self prescription. Full nursing provided the highest rate of weight increase during the 1st 3 months of life and greater weight gain for boys than for girls up to the age of 6 months. Gastrointestinal pathology, malnourishment, or hospitalization were rare events in this population. It is concluded that maternal milk alone, if produced in sufficient amounts, can maintain normal growth up to the 6th month of life. The study supports the choice of exclusive breast feeding on demand plus child growth monitoring up to 6 months over routine prescription of supplements at earlier times particularly where supplement administration fails to meet individual requirements.

Fertility regulation in nursing women. II. Comparative performance of progesterone implants versus placebo and copper T.

A clinical study was designed to test whether sustained administration of progesterone to nursing mothers could prolong lactation and delay the postpartum recovery of fertility. The hormone was administered by subdermal implantation of six pellets that each contained 100 mg of progesterone. This treatment was administered to 84 fully nursing women on day 30 post partum. Control groups were composed of 130 fully nursing women who received an injectably placebo, and by 125 fully nursing women who received a TCu 200 intrauterine contraceptive device. An exacting list of requirements for admission to and continuation in the study was applied to all groups. No pregnancies occurred in the progesterone-treated group from the second to the sixth postpartum month. This period coincided with the period of elevation plasma progesterone attributable to hormone released from the implants. The cumulative probability of pregnancy in the placebo group was 10.2 per 100 women at the sixth month. Treatment with progesterone did not change the duration of lactation or the rate of child growth, and no adverse effects were recorded. These results warrant further investagation of the use of progesterone as an alternative method to prevent conception in nursing women.

PIP: A clinical study was conducted to test whether sustained administration of progesterone to nursing mothers could prolong lactation and delay the postpartum recovery of fertility. Study participants were living in the Central Area of Santiago, Chile at the time of delivery. The hormone was administered by subdermal implantation of 6 pellets that each contained 100 mg of progesterone. This treatment was administered to 84 fully nursing women on day 30 postpartum. Control groups were composed of 130 fully nursing women who received an injectable placebo, and by 125 fully nursing women who received a TCu 200 IUD. An exacting list of requirements for admission to and continuation in the study was applied to all groups. No pregnancies occurred in the progesterone treated group from the 2nd to the 6th postpartum month. This period coincided with the period of elevated plasma progesterone attributable to hormmone released from the implants. The cumulative probability of pregnancy in the placebo group was 10.2/100 women at the 6th month. Pregnancy was the most frequent reason for termination from the 7th month to the 12th postpartum months in the progesterone and the placebo groups, both of which had a higher number of terminations than the copper T group. The proportion of women in full nursing ranged from 51.2 to 58.3 at the 6th postpartum month and from 10.7 to 17.6 at the end of the year. At the 12th month the IUD group had the highest percentage of women in full nursing and the lowest percentage of terminations. In regard to child growth, there were no significant differences between the 3 groups at any month when the averages were analyzed by Student's t test. In sum, treatment with progesterone did not change the duration of lactation or the rate of child growth. No adverse effects were recorded. Bleeding patterns were similar in the 3 groups. The local tolerance to pellets was good, and no clinical or laboratory side effects were detected. Results obtained with progesterone pellets are encouraging. Further study is needed to confirm their efficacy and acceptability.