so I'm watching this random movie while my son is playing next to me. & he was obviously paying…

so I'm watching this random movie while my son is playing next to me. & he was obviously paying attention bc he asks, " mom some girls have them and some dont?" I didn't understand what he was saying until he points to his chest. he pointed to the tv and I had to rewind it. 3 girls are walking down a hall way, one has big boobs, another normal and one is flat chested. I couldn't help but laugh lol