Especially when those friends are accommodating, take an interest in your child/children and willing to work around you?
Why do you now only associate with other Mums and think that they 'just won't get it?'
Why do you let them disappear from your life since you became a mother? Whilst I understand it's hard, it's not impossible.
There are far too many martyrs around who believe they're the only person to have ever given birth, everything must now revolve around them and that nobody else can ever be tired or busy, except for them.