DS (4 months) is breastfed (in case it's relevant) and sleeps like a dream at night - goes down at 7:30 and often sleeps 10-12 hours straight, occasionally will wake once to feed.
However, he just will not nap for a decent amount in the day. He gets tired and cranky so I know he needs it, but I just cannot get him to sleep longer than 30m in the daytime. I've tried nap cues like a book or song, using blackout blinds (like we do at night), making sure he has a full tummy, feeding to sleep/not feeding to sleep. He just cannot put himself back to sleep in the daytime, although obviously can do it fine at night.
Anyone have any tips?!