Just curious as to what month you would pick if you had any choice in the world. :)
My son was born in November and that was great!
Not heavily pregnant over summer, felt ok 'mooching around' in snuggly pregnancy clothes whilst waiting for him to arrive, enjoyed the distractions of Hallowe'en and bonfire night, the fun feel of running up to Christmas without actually hitting a Christmas Birthday. Also by Christmas we started feeling ok to actually see the family!
I also liked the fact all the months after were cool as I am such a worrier about him getting too hot. And sitting inside watching netflix didn't feel so terrible when we were so exhausted and it was all rainy outside!
Downside? Probably not the most fun Birthday when he's older! Also found Christmas shopping a tad stressful! Luckily no one expected much.