At what point in pregnancy does your milk change to colostrum ?

[BabiesEverywhere]

I am wondering if my milk has changed to colostrum recently, I am 21 weeks pregnant.

My 20 month old DD has been clean and dry for months and now is having the odd wee accident and much heavier wees in general and I heard on ECing boards that colostrum can affect an older childs outputs.

Could I have colostrum at this point in my pregnancy, I thought it just came in at the very end for the new baby ?

It does sound early, i would speak to your midwife or hv. I thought it came in once baby born but i could be wrong.

Thanks Bitcat, I will mention it ay my next midwife appointment.

I just wondered if anyone remembered when it happened to them, I know we have a fair few tandem feeders who must of fed though pregnancy.