9mo DS is currently in: long sleeved vest, sleepsuit (normal), 2.5 tog sleeping bag, flanelette sheet and a wooly blanket. If he gets too warm he kicks the top layers off or wriggles up the cot to avoid them.
Lauraloola, my ds's room goes down to 10 in the winter and he wears what you have described adn has NEVER woken from the cold or suffered from any chilly related ill effects, even as a wee baby. It will do her no harm at all if she is snuggled up in her nice nightclothes.
my DS's room is really cold and I have an oil filled radiator which plugs in, on a thermostat that I set low so it just takes the bitter chil off the room. Used it all last winter with great sucess and I don't think they are too expensive to run. Something like this but sure you can get them cheaper.
check what temp it gets down to in the middle of the night - i put ds to bed last night in a room that was 18 degrees when he went to bed (when the heating was still on) but noticed after a chilly night it was closer to 13 degrees when he woke up (just before heating came on). so if your room is starting at 13deg i guess at night it is maybe going down to 10 deg - so then i think roll out the thickest grobags you've got!
KnobblyBoneForkHandles are they expensive to run?we have zero heating. when ds2 was a baby hed wear vest,sleepsuit,cardi,gro bag or sawddled plus a blanket or two.and the sleepsuits were ones with fold over mittens so they didnt fall off.
now he sleeps with vest,pjs,jumper,duvet and blanket and its only october!soon we'll add dressing gown etc to keep warm.i hate this house
cheesesarnie - I asked DH and he reckons apart from the calor gas ones they are the cheapest way you can heat a room like that. So they aren't really expensive to run, but as with everything you would notice it a bit.
From one year you can use a baby duvet can't you, and those fleecy sleepsuits are great too.