Вот что пишет д-р Ньюман2. A woman who becomes pregnant must stop breastfeeding. Not true!  If the mother and child desire, breastfeeding can continue.  Some continue breastfeeding the older child even after delivery of the new baby.  Many women do decide to stop breastfeeding when they become pregnant because their nipples are sore, or for other reasons, but there is no rush or medical necessity to do so.  In fact, there are often good reasons to continue.  The milk supply will likely decrease during pregnancy, but if the baby is taking other foods, this is not a usually a problem.  However, some babies will stop breastfeeding if the milk supply is low. источникhttp://www.drjacknewman.com/help/Breastfeeding%20Myths.asp