I'm another one who thought that this thread really was about Scrabble! (Like, maybe the husband was embarrassing the wife when playing games of Scrabble with their friends, because he was bad at spelling, or never used the double and triple points squares, etc).
But seriously, where does this husband get off? (no pun intended!) The baby is only four months old! I've never had a baby, but I know it can be an enormous adjustment for the mother. I've even heard that a woman's libido doesn't return until around 18 months after the birth.
The husband needs to back off, and respect that his wife's desires and focus have now changed. They have the rest of their lives to play "Scrabble". But their baby will only be a baby for a short while. He needs to wait a few months (or even a couple of years, if necessary) and in time, I'm sure his wife will want to play "Scrabble" again.
(Please note that I'm not saying the wife should withhold "Scrabble" from him forever and ever. She should try and set herself a timeframe for getting back into the game - but I believe that she should be the one to decide (since it was her body that gave birth to the baby, and presumably it is she who is the primary care-giver).)