Are you and your child's father in a relationship? If you are then he can apply to come in on the basis of his relationship to you. Your child would be included as evidence of your continued commitment and your intention to love together permanently.
If you are not in a relationship but the father has been granted contact with your child through the courts, he can apply to come to the UK as a person exercising right of access to a child. It is usually necessary to get a court order confirming contact rights in order to be successful. He will need to show that he can afford to maintain and accommodate himself without recourse to public funds by providing he can demonstrate this and he can also provide evidence of a right to contact, he should be successful.
You would raise Article 8 as a ground when making your application but if he has a contact order then he is actually making an application under the rules and so it should be quire straight forward.
I hope this answers your question in which case please Accept. If you require further information, please ask.
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