My wife eats a lot after after a long day of taking care of our baby. Is it normal?

Taking care of a baby is soooooooo exhausting. So yes, I wouldn't be surprised to see a mom eating more than her usual at the end of a long day of looking after your little troublemaker :) Sometimes I eat lots because I need to replenish energy or sometimes just as a reward. Make sure to not make her feel bad about it (she KNOWS she's eating more) and keep healthy food around.