speak with the rabbi about this. i doubt your community if there is not always a minyan is on the level of the baal shem tov. rather than confronting try to see if you or others can help. as said by sjs try to see if someone can watch the baby during that time.
i’m no doc, but if the baby is 3-4 months, has a medical issue and is with the husband during this specific time, his wife might have ppd