Welcome JRMumma!
I don't have a problem with 2nd hand car seats that you know the history of, but personally would avoid one just incase there was a fault/product recall.
babyh, my sister went through a stage of having nits for about 2 years when she was a kid, whenever my mum thought she'd won the battle she'd pick them up again at school...no one else in the household ever had them during that time, so maybe DSD mum isn't aware how bad it is because she doesn't have them?
Remembering, hope DH's back starts behaving itself soon so he can start playing nursemaid to you 
I've not had it this time around but with DS I had really itchy/tender stretch marks...I would say being pg in summer would probably make it more irritable but we don't seem to have any sun atm!
Nothing 'bump' related for Fathers Day here, but DS has already done 4 poos today, so I assume that's his version of a present for DH. 
Hope everyone has a lovely rest of the weekend!
33+1