I have this running debate with friends and family on how everyone calculates their babies number of months they are. Today jaz ( my first baby ) is 16 weeks old, i assumed that meant she was 4 months old however my friend who has a baby born 3 days after mine ( 27th feb ) goes by the 27th of every month. i couldn't find much online if there was a right or wrong answer so i thot id pop on here for more opinions. Do you go by the same date of each month, or the weeks? ( apologies if that didn't make much sense i'm still suffering from severe baby brain!! )