My LO is 7w now and exclusively breastfed. He is a lovely baby, very sweet, social, doesn't cry much. My only concern is if he is getting enough sleep. He sleeps alright most nights, about 7 hours (with one or two feedings in between) but nap time is horrible. No matter what I do he only sleeps for 3-4 more hours during the day. Can it be a problem?