Is it beneficial?

 

פרשת השבוע וילך טף למה באין, כדי ליתן שכר למביאיהן חגיגה ג' ע"א   The Gemoro asks why were the infants brought to the  mitzvah of הקהל. The Gemoro answers, to reward  the ones who brought them. (the parents) From this Gemoro it seems, there is no benefit for infants, to listen and absorb the learning, otherwise, the simple answer would have been they came to listen so to have  the Torah absorbed in them. How do we explain Chazal ( Yerushalmi Yevamos 8b) The mother of Reb Yehoshua brought him in his crib  (infant) into the Bais Haknesess so his ears will be attached to Torah? Mori V’rabi Harav Hagaon R. Shlomo Miller Shlita Said :  The Gemoro originally held, there actually is no benefit for a child who  doesn’t understand to listen. The Torah doesn’t get absorbed just by listening to it if you don’t understand it. The Gemoro answers, Hashem rewards parents who bring their children to the Bais Hamidrash, to absorb Torah. The reward is that Torah does get absorbed in the children and they become Talmidei Chachamim. This is the  שכר למביאיהן Since it is a reward to the parents, this Segulah works only when the child was brought to the Bais Hamidrash to listen and absorb Torah, therefore, the parents are rewarded. However, If the child was brought to Shul  just so the mother can have a break etc, and not for the child to absorb Torah  then even if the child will be listening,  the child won't benefit from it since there is no reason to reward the parent.