I can't imagine leaving a 14-month-old on the floor, not because of safety concerns, but because my 14-month-old would have toddled away every chance he had!

I don't know what will happen on United, but I bet the TG flight attendants will play with and watch your child while you eat and use the bathroom. I've had flight attendants do this on LH, OZ, CX and TG. In all cases, the flight attendants volunteered.