Our DS is 14 weeks and has had a few unsettled nights (getting up at 1:30pm) which is not like him. Prior to this he was sleeping through the night. But last night he slept through again so I'm hoping it was a grwoth spurt and things will be back to normal until the next one. I have heard they have one at the 3 month mark so maybe this is what's happening and he will settle in a couple of days. Does anyone know if these growth spurts keep interfering with their sleep or do they settle down after awhile?