How do I keep my wife happy?

People say women are complicated but the only thing she probably just wants is you and your love. Just love her and she'll be happy.

be interested in what she has to say. spend time with her. be her champion. make her laugh. date her.

https://www.jw.org/en/publications/magazines/awake-no3-2016-june/communication-in-marriage-problems/

Be an involved father. Initiative is a plus point. Give her time to relax and away from baby too. :)

https://www.jw.org/en/publications/magazines/g201512/differences-in-marriage/

Love Your love that's the only genuine thing left .

https://www.jw.org/en/bible-teachings/family/couples-parents/