My office is also really hot! There's a teeny tiny window in there which lets pretty much no air in! Might see if I can check the temp some how tomorrow.
frenetic my belly button never popped with DD and it is still very much an innie at the moment, so we'll see! I can't remember what you're having frenetic because my theory is belly buttons tend to pop more with boy pregnancies?!
As for Vit D, I don't take any supplements myself but I do give DD vitamins daily which include vit d (this came after advice from the HV after she said children lack in it)
Ordered the surf board today to go with my surf pram, another thing ticked off!