Now with my eldest son, I was completely confused and dumbfounded when he was a baby and had drastic mood swings. Mainly because he was such calm and quiet baby so when he'd be crying more than from being hungry I was really concerned. When things seemed out of wack like him suddenly waking more frequently at night or him protesting and screaming bloody murder for a diaper change, I'd turn to google to figure out what was going on. I ended up finding baby forum chats about other parents going through similar events. The conclusion and answer to their baby's new behaviors was that they were in a leap!