I just spoke to a mother who is breastfeeding her 15 month old son, and just
found out that she is pregnant. Her doctor told her that she has to stop
breastfeeding immediately. Why? Because there is a hormone present in her
milk that will cause problems in the sexual development of the older child
( I think he said that the testicles would be affected and this would only
be apparent at puberty). I asked her to ask the doctor for the study from
which this conclusion was derived. Has anyone heard of this?
While searching, I did find this tidbit:
Physiol Behav 1996 Jan;59(1):147-52 Related Articles, Links
Does the male reproductive performance depend on the early lactation milk in
rats?
Carlos CP, Lemonica IP, de Grava Kempinas W, Marques Pereira OC.
Department of Pharmacology, Sao Paulo State University, Brazil.
This study investigated the role of the early lactation milk (ELM) on the
male reproductive performance and the participation of GnRH on this effect
in Wistar rats. Newborn males were divided into three experimental groups:
1) ELM-deprived pups, 2) ELM-deprived pups treated with exogenous GnRH 1, 7,
25, and 31 h after birth, and 3) non-ELM-deprived and without exogenous
GnRH. In relation to the other two groups, the ELM-deprived male rats
exhibited as adults: reduced fertility, decreased weight of both vas
deferens and seminal vesicle, and reduced levels of fructose in the seminal
vesicle and prostate gland. We suggest that the intake of ELM during the
neonatal period is important to the later sexual development of rats, and
that GnRH is somehow involved in such an effect.
Esther Grunis, IBCLC
Lis Maternity Hospital
Tel Aviv, Israel
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