We have a 6 week old who generally sleeps well at night. He goes to sleep around 7pm each night then we usually wake him about 10.30pm for milk. He then settles off to sleep easily and quickly after that. He'll wake anything from 3-4.5 hrs later for more milk but after that bottle he has started, the last week or two, being really restless, noisy, won't sleep in his crib etc. We have no idea why or what makes that sleep so awful.
Any ideas?