Or so it seems!
We have a 3 week old (this Wed). So far my wife has been breastfeeding and things have been going pretty well. We've had to do 1 or 2 top-ups with formula but nothing major, and he was well into the feed-play (briefly, and occasionally) sleep routine every 2-3 hrs and going back to sleep well at night after feeds with little awake time. He was putting on weight and things were peachy.
Over the last couple of days though it appears to have fallen in a heap. A few times he's not slept for a few hours in a row - just cranky - after short plays and often has 3hr awake periods and then won't sleep. We've tried frequent feeding (up to every hour, including night time) as he has ramped up the demand for breastfeeding but he still goes hungry, so we've had to increase formula to 2-3 times a day. He'll often fall asleep while breast feeding or bottle feeding but then wakes very shorlty after, hungry and grumpy. He won't settle to sleep easily either - fighting it all the way.
Just not sure what has happened! It's starting to stress my wife and I out a little as we don't know what's happening.