I am a frequent seeker of the last row of J on the 777, which is usually a cot seat. They get opened up at T-72, but you cannot reserve them online; you have to call. I have never been bumped to another J seat in well over 30 times of doing this. I have been op-uped from these seats though.

I must say, having flown with infants in the distant past, I would (with a heavy heart) take a different view from Jacaranda and give up my seat for an infant-bearing parent.

There is a down side of being near the cot seats - sometimes the infant-noise is unbearable!