If you are talking about having a baby with a non serving man know it is possible, the military will do its best to facilitate things, but you will very much be the non-present parent, away at short notice for for long periods, you will be sidelined in a way that hurts serving parents, missing key growing up points and your significant other will have to accept being a very hands on parent with highly likely no family close by for help. If you are both serving you will find it far harder with families being vital to ensure neither of you lose your jobs when things come up at work.
Honestly the military is HARD to be a parent in, one friend is finally getting posted near his family and able to spend more nights at home finally and painfully for both him and his wife, his kids are angry and rejecting him because they don't like the change - they love him but they are used to their mother all to themselves.