Born at 37 weeks, he is now 8 weeks, he sleeps almost all day and night, he'll stir to feed and he feeds hourly in the day 3 hourly at night. He hasn't smiled yet, he doesn't interact at all, he cries a lot and needs to be permanently held, won't last more than a minute without crying if not in arms. He still seems the sane as he did at a few days old just bigger. I can't help but compare him to my eldest who had much longer wake periods, fed less and smiled by now... normal or cause for concern?