Fear of Failure/Inadequacy
At the heart of virtually every man's quest for a successful relationship with a woman is the desire to provide: to impress her with any combination of looks, intelligence, wit, wealth, and status because these things allow him to offer respect/social prestige/spending power/entertainment value. In romantic relationships, a part of guys' concerns focus on whether they have what it takes to make a woman stay with them. Similarly, one aspect of fatherhood fears is the ability to secure a place in the child's life through being useful. How will he figure out how to take care of the baby? Can they really afford a child if his wife stops working? Will he be a good dad?