Ok let's just stop right there we all know that even as humans these four look hot as hellfire. An also look at April's face I do not think she was excepting that. Master Splinter just looks like a father who wonders what he did wrong which was nothing.
I imagine that this would pretty much be the brothers’ reaction if Raph brought home a turtle-salamander-hybrid-baby to the lair. Leo is weirded out by the idea of his brother suddenly becoming a family man, Donnie can’t compute how this is child.