Some friendships change as you go through different life stages. You'll probably have had different groups of friends through school, college, and different jobs, with one or two close friends throughout. Friendships often develop with people when you're at a similar stage in your lives. This means that during your pregnancy and when you have young children you may feel most comfortable with other women in similar situations. You'll meet new friends at postpartum classes or post-partum groups, or in situations such as toddler swimming or music classes.
As you make new friends, you may find your old relationships begin to change. Friends without children may find it difficult to understand your new role as a mother, and the intense love that you have for your child, and you may start to drift apart. Of course this is not always the case; some friendships are unchanging, irrespective of whether your lives go along different paths.