14 mth old early morning wakings

[Abwab]

My 14 month old DS has, for the the last couple of weeks, started waking up at 5-5.30 in in the mornings. He has slept through the night from 8 weeks and has always been brilliant at going to bed, sleeping and re settling himself if he did wake. Up until this problem began I have always had to wake him at 7am so it is not as if he has gradually been waking earlier and earlier.

He had his MMR jab round about the time this started and i wonder if it is connected in anyway.

I don't go into him as soon as he starts crying but if he does get really upset I go in, reasure him and come straight out again. He may fall asleep again only to wake up 15-20 minutes later. Is controlled crying the only way to go?

I hope it's a faze and will soon pass. Has a similar thing happened to anyone else. Is anyone able to offer me any advice?
Thanks

No solution I'm afraid, but my 15 month old ds has just started exactly the same thing - awake and chattering at 4.30am this morning ! I went and checked on him and he eventually fell back to sleep. He had his mmr a while ago so it's not that. Let's hope it's just a phase with them both...is you ds warm enough ? Thirsty ? Nappy wet ? I've had all of these waking mine in the past, but not sure what is waking him now...sorry to not be more helpful.

How much sleep (and when) is he having in the day time? If it's too little, too early then apparently they go straight into a deep sleep at night time and wake up early!

thanks podkin and Flutterbye.
Podkin, i do all the usual checks ie warmth, dirty etc and it doesn't seem to be any of those. Fingers crossed that we and our children both get an uninterupted nights sleep soon.

Flutterbye, good point. He has also cut back on his lunchtime sleep. Up until 2 weeks ago he was having about 2 hours (12.30-2.30) but he has cut this back to 1 hour. I do all I can to give him a chance to settle himself back to sleep at lunch time but he just seems so full of beans. He did have 1hour 40mins at nursery today so i'll see if that impacts on his waking time tomorrow - thanks.