<human>: Can you condense the text into a few key points?

It started a few months ago and has got better and worse since then. Basically they (two girls both 19) always tag me in baby related things on Facebook, make comments on the time I go to bed, if I appear at all weak/shamed they'll use the go-to phrase "*aww look at the poor baby"*, if I don't understand something I'll be too young to understand, if I'm doing anything *at all* it's considered cute (not the good kind of cute), and if I'm doing anything a baby shouldn't do they'll make snide remarks. They both find it absolutely hilarious and whenever I get remotely annoyed at anything they'll comment about being an angry baby, yet when I try sound calm my accent comes out and they comment on that. 

I've tried asking them to stop and telling them how I feel but that obviously didn't work. I've also tried laughing at them (they really scrape the bottom of the barrel sometimes and the jokes they're making are just god awful) but that hasn't stopped them in the long run. I'm trying to ignore it now but if they make the jokes to my face and I just ignore it I'll be seen as a moody baby. 

I know this whole thing seems *childish* but I don't know why people do this to me. Other friends have called me the baby of the group in the past but I've asked them to stop and its worked. I'm quite skinny but average-ish height at 5ft7/8.
<bot>: My friends try patronizing me all the time by calling me a little baby and I don't know how to stop them.