This is a blog that I found very helpful, with a lengthy discussion about sweet potato allergies.
You don't really have to click on it if you don't want to, but I thought I would give a little update and just say that I was surprised to find out that apparently it is a real thing.
I've never heard of a sweet potato allergy and thought it was weird... actually if I'm being honest, I thought it was all in my head and that it was pretty much impossible for her to have a sweet potato allergy, but I'm having a hard time building my case since she has reacted to them 5 times now. The first few times she just broke out in a rash, but this last time she broke out in a rash and threw up 3 times within a couple hours of eating them. Once it was all out of her system, she was fine and has no other symptoms of illness, so I don't think it's a stomach virus (and no one else here is sick... knock on wood).
Anyway, there is a discussion that takes place in the comments portion of this blog and lots of posters shared their experience with this. Their children pretty much have the same or very similar reactions as Charlotte... rash, vomiting and fussiness within a couple hours after eating sweet potatoes. Two of the posters were adults who have similar reactions and never outgrew the allergy. All of these posters have said that their doctors brushed it off and didn't want to believe this could be a possibility, and there are only 3 documented cases of real sweet potato allergies worldwide. Kind of disheartening... not that I want her to be plagued with any sort of food allergies, but a little support from the doctor you are partnerered with is nice to have, and I feel like awareness is key to bringing anything under control. I'm sure those with sweet potato allergies live very normal lives and aren't missing out on too much... I'm just hoping this is not an indicator of what's to come. So far she hasn't had a reaction to my BM and I've had plenty of milk and peanut butter in the past 8 months, so that is good.
Anyway... whether she does or doesn't have a "true" sweet potato allergy, she most definitely has a strong reaction to them, so I'm assuming a sweet potato allergy just to be on the safe side... and to avoid cleaning up puke all night.