When my daughter was born and her dad walked into the room and spoke she seemed to look in his direction or move around more in my arms. I think if a father is very attentive and hold their son and daughter from the start the baby will recognize them right away. Normally, when holding the child the father should softly speak to the baby so they know he is there and how much he loves them. For some reason, children know their parents and when they walk in the room or they speak I would suggest that your husband hold your son/daughter as much as possible. Help in changing their diapers or giving them a bath. This is the special bonding time that a father can have with their child. This is very important to the baby that the father helps out in their care each day. This will help increase the bonding between father and child. When you give your child a bath at night, you both should be there bathing the baby and putting the baby down for the evening.