Yeah, that's what I meant when I said that a newborn is usually with her mother. I'm just saying that Yoda and the others might have found it too risky to keep Luke there (the twins never really have been considered equal as it was Luke who destroyed the Death Star and Vader), but rather to send him to a far off remote place guarded by Obi-Wan. Had circumstances permitted, then it would have been safer, I agree, to stay with his mother.