Should we be concerned over toddler pointing out private parts we have not yet taught him?

As background, Son is 2 - we are potty training and working on male anatomy. Son is in daycare full time M-F. I stopped breast feeding when son was about 1 year old and while we fully intend to introduce him to female anatomy we just have not really addressed it yet (no reason in particular).

Now to the concern - son recently walked in on me changing and pointed to my chest and said “Mommy’s boobs”. Then he proceeded to try to grab for them and became frustrated when I told him we were not going to touch. I was completely thrown off guard and tried to figure out where he learned about boobs and reiterated that we do not touch other people’s boobs.

Again, we understand it is appropriate for him to learn anatomy but this is something we have not taught him and I cannot fight the pit in my stomach I have when wondering where he learned this and why he thought it was okay to try and grab them?

The only place I can think he was exposed to this was his daycare - is it normal for daycare to teach anatomy like this at 2? Seems like something they would let us know about? I am going to bring this up to daycare because something is just not sitting right with the whole scenario.

Just looking for any advice and also trying to understand if I am totally off base here with my feelings about the whole thing.

Thanks!