Why has my 11mo stopped sleeping through?

[happytree]

DS has slept through the night since he was 3mo but this all changed about a month ago. He wakes up, stands up and cries in his cot until we go through to him. This happens about 5/6 times a night. Usually he'll go back to sleep after about 10/15 mins of reassurance but DH and I are both really starting to suffer.
I've tried moving/ shortening naps, more food/ milk before bed. He gets plenty of exercise, has a dinner, play, bath, snuggle bed routine.
Does anyone know why the drastic change?
Thank you

there are various points at which babies go through "sleep regression" and their normal pattern is disturbed. It usually coincides with either a major change (as in my case when I went back to work) or a period of growth / development like learning to walk which could be the case for your DS. Apparently their little brains are working overtime and can't shut down as well. He is also much more aware that you are separate people to him now and CAN not be there so separation anxiety can kick in. Bear in mind the time of year too, more light, birds tweeting etc. In short, there are lots of possibilities. A month is a long time for 5-6 times a night disturbance and I really symapathise. Ours (19m)has been sporadically waking up 1-2 times a night for the last few weeks and we're not sure why but these are phases and they will pass. The only thing I can really suggest is not to worry too much about setting up a bad habit like feeding him. Milk settles DS so we often give it to him if its 3 am and we have work the next day but he does not wake up in order to get it and has not developed a dependency on it. On a previous phase of this around 13months we brought him into our bed occasionally (having never previously co-slept) and it worked on those nights we needed it to. When the phase was over, he settled fine in his own cot again, so do what you have to do to get through it. Best of luck.

i would second what trixie123 has said. DD is 11 months and is doing something similar at the moment though not to the same extent. She is only waking once during the night (but once is enough!). She is on the verge of walking at the moment and i think that is what is doing it. She went through a similar thing when she was learning to crawl. All we can do is roll with it.

I try to settle her with cuddles but if it is not working then i will make her up a small bottle of milk and give it to her. I havent taken her into our bed becuase i know that wont work for her. It would be an invitiation to play as far as she was concerned.

I hope it gets better for you soon.

Thank you for your help.
Just hope it passes soon.