Even though you've been through the joys and hardships of carrying a baby doesn't mean that things will be the same during your second pregnancy. Your first experience will certainly prepare you for some of the things you can expect while carrying baby number two, but being pregnant while already having a child is definitely a game changer. From second-child syndrome kicking in way before birth to suffering from baby brain to the extreme, these are the 15 surprising things you'll learn during your second pregnancy.