My 11 week old son has gone from sleeping really well at night, to waking up every 3 or 4 hours all night. He used to go down at 9pm and sleep through to 4 or 5. Would feed him then he would sleep another 3 hours. Now he’s waking at 12:30 or 1, having a bottle, then waking up 2.5 hours after he’s gone back down. After the second bottle he only sleeps about an hour. We are wondering if it’s cause we are away for Christmas so it’s the change in environment. The night before we went way he slept 9-5, then 5:30-8.