Last night Bradley sleep a soild 8 hrs. Hes a month old (today actually) and he weighs just over 7lbs. Is it bad that I let him sleep through the night or should I be waking him up? He is gaining weight well and with DD1 I fed on-demand from day one and she gained crazy weight. I just worry because he was small when he was born and his sister is still waking up every 3-4 hrs (although she is smaller then him).