She's very laid back.
We only notice the temperature because she still has a monitor and it's clearly displayed on that. She rarely wears a vest under her sleepsuit, even in winter. Her room seems to stay at a constant temperature. She only wears one if we go to stay with my family, as their house can be freezing at night.
It's probably different with a duvet, because I bet they don't stay on all night. But with a sleeping bag, 18-20 would be too warm for a vest. I go by the Grobag guidelines. If she seems comfortable then she's probably alright.
When DH is away and I have to bath DD I have to use a bath thermometer as I have no sense of temperature! What feels too cool to me is hot to DH (and the thermometer!).
Oh dear, bean. DD is still happy to go in her high chair but with my PGP and now sciatica I've really had to try and limit lifting her (luckily I'm ok because I am being quite careful/ lazy). We seem to be naturally phasing it out because she has breakfast in bed with me most days now and for the past few weeks lunch and dinner have been outside in the garden, on the table and chairs out there. She has a little table and chair inside too.
Will be thinking of you on Friday, hope it all goes well. I have my 36 week scan then too and I finally get my section date. Though I'm convinced I'll go into labour before then.