***TASK*** the task is to summarize an input biomedical literature in six sentences 
    ***INPUT*** the input is a biomedical literature 
    ***OUTPUT*** the output is the summary of an input biomedical literature in six sentences 
    ***DOCUMENTATION*** 
    ***EXAMPLES*** 
    Input: A study was conducted to determine whether the onset or maintenance of lactation might be influenced by the administration of ovulation-inhibiting drugs for contraceptive purpose s when they were taken : 1 ) before the beginning of the lactation-period ; or 2 ) during the lactation period . The  milk yield of 100 mothers who received an ovulation inhibitor ( 2.5 . mg lynestrenol ) from Day 1 postpartum was investigated . In order to exclude psychic factors 50 % of the tablets were placebos of identical appearance . The administration of the ovulation-inhibitor from Day 1 postpartum did not influence the commencement of lactation of the total milk yield in the first 10 days of the child-bed period . No clear influence on the milk yeild was observed during the subsequent observation period of 4 weeks . No differences were observed in another double group of mothers 70 women altogether who received the ovulation-inhibitor or the placebo  from Day 10 postpartum The study was design ed to test the long-term influence of a low-dose combined oral contraceptive upon lactation and infant growth when treatment was initiated at day 30 postpartum . The contraceptive tested contained ethinyl estradiol 0.03 mg and levonorgestrel 0.15 mg . Two control groups were formed by women who received an injectable placebo or a Copper T at day 30 postpartum . Women in the injectable placebo group received non-hormonal contraceptives at day 90 postpartum . An exacting list of requirements for admission and continuation in the study was applied to all groups . The oral contraceptive group had a significantly lower percentage of cases in full nursing from the 4th through the 10th postpartum month when compared to both control groups . The average absolute weight of infants in the oral contraceptive group was significantly lower at several ages when compared to the placebo group but not when compared to the Copper T group . No adverse side effects upon infant 's health were detected . It was concluded that the oral contraceptive tested showed a moderate inhibitory influence upon lactation when treatment was initiated at the beginning of the second postpartum month 451 women who delivered at St. Josephs Hospital Copenhagen from July-September 1966 were given a daily tablet of Norinyl-1 ( norethisterone 1 mg and mestranol .05 mg ) or a placebo from the day after birth until discharge on Day 8 . Lactation was assessed by the patient and the nursing staff . Significantly more women ( p- < .01 ) who were taking Norinyl-1 used supplementary feeding . There was no significant difference in 1 ) infants weight gain between the 2 groups and 2 ) febrile breast engorgement between the 2 groups although it seemed to be slightly lower in the drug group The study was design ed to test the short-term influence of a low-dose combined oral contraceptive upon lactation and infant growth when treatment was initiated at day 30 postpartum . The contraceptive tested contained ethinyl estradiol 0.03 mg and levonorgestrel 0.15 mg . Two control groups were formed by women who received either an oral placebo or an injectable placebo at day 30 postpartum . An exacting list of requirements for admission and continuation in the study was applied to all groups . The oral contraceptive group had a lower percentage of cases in exclusive breastfeeding at day 91 postpartum when compared to both control groups . Infants in the oral contraceptive group showed a significantly lower average absolute weight at days 61 and 91 postpartum and a significantly lower average daily weight increase during the first month of treatment when compared to both control groups . It was concluded that the oral contraceptive tested had a negative influence upon lactation and child growth 
    Output:
    
CONCLUSIONS Limited evidence demonstrates an inconsistent effect of COC on breastfeeding duration and success .
The evidence is inadequate to determine whether a mother 's use of these drugs affects breastfeeding duration or the infant 's health