Reference for Shabbat 274:4

במתניתא תנא רשב"ג אומר קטן המסורבל בבשר רואין אותו כל זמן שמתקשה ואינו נראה מהול צריך למולו ואם לאו אינו צריך למולו

AND IF HE IS FLESHY, etc. Samuel said: If an infant['s membrum] is overgrown with flesh, we examine him: as long as he appears circumcised when he forces himself, it is unnecessary to recircumcise him; but if not he must be recircumcised. In a Baraitha it was taught: R. Simeon b. Gamaliel said: If an infant['s membrum] is overgrown with flesh, we examine him: if he does not appear circumcised when he forces himself,<span class="x" onmousemove="('comment',' To cause his bowels to function. ');">²</span>

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