The factor that would NOT affect a baby's size is the father's poor eating habits during pregnancy, as the mother is responsible for the baby's nutrients. In contrast, genetics, maternal smoking, and poor maternal diet can all negatively impact fetal growth. Therefore, option D is the correct choice. ;
The factor that would NOT affect a baby's size is D. The father eats poorly during the pregnancy, as the mother's health and nutrition are what directly influence the baby's growth. Other factors, like genetics, maternal smoking, and the mother's diet, can all affect fetal size significantly.
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