I also heard from the Strupkover Rebbe that a zechus for sons is to:
1. Make Kiddush on red wine 2. Light 2 candles after havdalah (peru uh revu) and 3. Eat warm bread and a warm drink for melavah malka.
Rav Moshe Turgeman also told me that we should work on being mekabel ol malchus shamaim and accept with love what Hashem gives us. From there is the source of all bracha.