After you get the costudy, it is hard for him to change the court order. Having such a young child whose primary caregiver is the mother and wanting a divorce, your husband does not really care about the child. I saw some divorced parents got the 50/50 custody. When the men gets new wife or girl friend, they don't take care of the child any more and refuse to pay child support. In such case it is hard for the woman to get the child support because the court order is already there. Go and find a good lawyer.