My best friend's husband went through a bout of daddy postnatal blues because he felt helpless for not being able to help his wife who was having lactating issues and it didn't help that he was working in shifts and barely at home. He kept it to himself for the longest time but eventually broke down when his wife noticed his subtle changes. She was shocked that he didn't think to discuss about his worries to her. They had a long talk about everything and things got better after that. So if you ask me, communicating with your partner is the best thing to do in situations like this. Mommy and daddy are in this for the long haul; if you can't talk to each other about such stuff, then it's just gonna continue to mutate into more negative energies.
Also, my best friend's husband opened up to his other daddy friends in case there are issues he is more comfortable discussing with his male friends.
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