7mo excellent sleeper, now howls at bedtime! Why??? What would you do??

[ellensmelons]

She has slept so well since she was about 10 weeks old, and i could put her in her cot awake where she'd settle herself. I only had to pop in a couple of times to put her dummy back in and then it'd be pretty quiet till 6am.

But since the weather got hot, or for some other reason, i now put her down at the usual time (7pm) but she SCREAMS after about 5 mins! And she doesn't stop until she's stroked or picked up, regardless of where her dummy is.

Now, i'm 17 weeks preg and hoping this is just a blip - but what do i do????? The voice in my head tells me not to pick her up, not to stand there and stroke her to sleep etc because then she'll expect it all the time. But i really don't know what else to do. She's not too warm as have changed to 1 tog grobag, and her usual routine is still the same.

Could she be getting to that age where she gets upset if i leave her? She seems ok in the day tho....
Help.

[ellensmelons]

Hmm - gone down straight away this eve. Keep fingers crossed. Did nothing different from last night!

Tis a bit cooler.....

She has been with the childminder all day...

I could be over-analysing this...