It is just that people sometimes enter different phases of life at different intervals.
Let me share my story, sorry if it is long.
I had two good friends at University, they were sisters, and were tied to eachothers hips. You rarely saw one without the other. We had fun during Uni, and had some great nights out dinging and drinking early in our professional lives. They lost interest in me from the moment I shared the happy news I was pregnant.
I made arrangments to meet them for saturday lunch once, when my now oldest was 6 months old and absolutely gorgeous. I brought him, and another friend who was smitten with him and more than prepared to "muck in". They were oohing and aaahing, and how cute he was. But they never replied to my emails after this meeting. I heard Nothing, nada, zilch.
UNTIL 1 1/2 years ago when my son was 4. One of them emailed me with the happy news her sister had just had a little baby girl and should we meet up sometime? I emailed back and congratulated her, and let them now I had now had a second child, and wished her luck in her life as a mum.
So, I got my "revenge"? Does it feel sweet? Not really. They were not willing to step down a pace to let our friendship continue after I had a child,they were not willing to meet up earlier in the day and facilitate me bringing a baby, it was a heavy drinking session or nothing. So nothing it was, as my boy breastfed every two hours throughout the night for the first 9 months.
So why should I come running just because they (or one of them) had entered the same phase in her life as I had been on the last few years? So, in reality, ours were not a strong friendship. My true and real friends have been able to show understanding (without pity and being patronising) despite not having children themselves. They have let me moan and whinge about cracked nipples even if they never experienced it. They have come to my place for coffee rather than going out, and said: "you look knackered, let me sweep your floor it looks horrid. Or, that is a lot of laundry, what can I do, or Woman, go get a nap, I play with baby". Those are friends to keep. The others I would let go.
Sad? Yes maybe, agonise over it now, once and for all, rather than prolonge the agony and feel bad each time you meet them, talk to them, etc. They are on different planets. Dont wait around for them to get kids. Maybe they wont. Or maybe they will but will get full time night and day nanny and be none the wiser. Just chuck them out and get new friends. Life is too short, have fun and enjoy your baby and your new phase of woman hood.