I'm sorry. I love kids. I really do. I have friends with kids who call me Aunt Dani etc. Worked with them for over 10 years. But no your 15 month old is not invited to our wedding.
One BM does not go anywhere without her child. I am not sure if she is overly attached or the kid is overly attached (at a year the child will not go to anyone else, including dad!) or if BM just doesn't think about the fact that 1 year olds don't always mix well (read: getting ready for my wedding in a small bridal suite with 6 other people....what is a then 15 mo old supposed to do for hours?)
In passing conversation about bachelorette party/rehearsal dinner/wedding schedule (Thurs,Fri, Sat) I told her 'hope you have a good babysitter lined up!' and she replied with "Do I need a babysitter for the rehearsal dinner? Do I need one for the wedding?" Ummm did your invitation say "The so and so family?" "Mr and Mrs and baby?" No. It didn't. *cont in comments*