Your dog's heart rate may slow, the lower thyroid output leading to less stimulation of heart contractions. (dogcare.dailypuppy.com)
Additionally the mother receives less stimulation when the baby is given water supplements which may have an adverse effect on her milk supply. (motherandchildhealth.com)
They may also put formula in the bottle not realizing they could put breast milk in the bottle and every time they replace the feeding that way their body is getting less stimulation. (pregnancymagazine.com)