There is a lot of information still needed before an attorney could even begin to assist in guiding you on this question. For starters, is social services involved? If so, have you been in contact with the worker? Is the case in court? Were you and the mother married when the child was born, etc. You can see there are lots of things to still know. It is advisable to hire an attorney who is experienced not only in custody matters but matters where social services are involved to help you.
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