Hi Mum2boy - my DD was a shocker for this when she was a baby. Basically, babies sleep in cycles of 45 mins, so what is happening is that Cooper is going to sleep but waking after one sleep cycle.

I ended up getting help from Tresillian because it was doing my head in, a baby needs to sleep more than 45 mins at a time to be truly rested.

Basically when he wakes up after 45 mins, you need to go in and resettle him to sleep, however you usually do this. Try to do it without picking him up out of his bed.

I used to just sit quietly next to DDs cot without making eye contact or engaging her in any way and pat her until she went back to sleep. Most of the time it worked, but sometimes it took ages and sometimes it just didn't work!

It is totally frustrating at the time but I'm glad we persevered because my DD has been a champion sleeper ever since. I know mum's who just thought it was better to go with the flow and not sort out their sleeping dramas and they are still having them now, 2 years later!

In your case, I wouldn't be surprised if it doesn't take long at all because from what I can gather from your post, it's only a recent habit that he's developed? So the sooner you nip it in the bud, the better!

Good luck!!