The claim about a baby is extremely problematic, to say the least: https://averagebeing.com/fact-check-did-hamas-bake-a-baby-in-an-oven/

As for the rape stories, I think there is some truth in them because one Jewish woman testified that she was ordered to strip by one Hamas fighter, but another one stopped him. How much truth is in them, we will not know because Israel has been astonishingly lax when it comes to trying to provide evidence, even though the procedure for documenting rape in war time is well established.