That's obvious to anyone who knows how humans replicate. The sentiment of the comment was that the timing was unfortunate because the kid was born in the same

That's obvious to anyone who knows how humans replicate. The sentiment of the comment was that the timing was unfortunate because the kid was born in the same period that had presumably something else going on on the work side. Not that the child was born. So either the OP had some prior "history" with his manager, which changed the literal meaning of the comment, or he is reading too much into it.