January - A dreary month where nobody wants to celebrate your birthday as they are too ill/skint, or on a diet etc. Also too close to Christmas so annoying for present giving (my DH is Jan and I have exhausted all my present ideas at Christmas so can never think of anything for his birthday!)
Feb - Nice I think. Getting lighter, spring is in the air. Can bundle a newborn up and go for walks without worrying about them overheating. People more up for going out again. Nearly perfect!
March - Ideal I think! Not heavily pregnant in the heat, the weather is getting less gloomy by the day. Not one of the eldest or youngest at school so less likely to struggle or be bored. A good time for an off peak birthday break somewhere in Europe!
April - This is mine. Again nice for reasons above.
May - Jul - Not good when a small baby as newborns and heat are stressful! However great once older as summer birthday parties outdoors are lovely, don’t have to pay for childcare as long and once you are an adult a summer birthday is great because everyone is up for a night out!
Aug - As above, but more difficult for children as youngest in school year (my DD is aug)
Sep - No as wouldn’t want to be pregnant in the heat either! Also has a bit of a dreary ‘summers over’ feeling and expensive childcare for the longest. Fine for adults though!
Oct - Nov - I think these are good months to have a newborn as you can snuggle up indoors and not feel guilty for missing good weather! As a child will be older in the school year which is beneficial.
Dec - I wouldn’t mind an early December birthday as it feels quite magical and everyone is getting festive and up for a party! But difficult with presents, same as Jan, and the closer you get to Christmas the harder it is to get everyone together.
Overall I’m going to vote March with October as a close 2nd. That was fun!