My son has always been a good sleeper and even from birth only woke once or twice in the night. Now at 11 weeks old he has started properly sleeping through the night for the past week in his next to me from 10pm until 9am ish with no wakeups of any kind. Is this ok or do I need to worry or wake him? He also naps well in the day and will have 1 hour alert wake windows between naps, sometimes going longer between naps in the evening. He had some difficulty gaining weight during his first month and went from about 95th centile at birth to just over 25th. We are now combi feeding at weight is better at around 50th. Healthcare professionals have not shown any worry about his weight since we got him back to birth weight.