My 10 week old son has just started to interact over the last 3 weeks or so with smiles and noises. I make sure he has tummy time when he has a feed, but I obviously wait a while so his food goes down first. But I have noticed the last 3 mornings he only has about an hour tops of sleep. Is this normal at his age? How many sleeps and for how long should he be getting during the day at the 3 months mark? He sleeps well at night, getting from midnight till about 7ish.