Proof that babies learn in utero

We are always telling ChaCha to "Go Potty" when we take her off her cage and about every 15 minutes while we have her on us. Its easier to catch it on a napkin than find it on us later. Jeremy and I joked that Nathan's first words would be Go Potty since he will hear it all the time. Well, today I was holding Nathan and picked ChaCha up (trying to get her used to him) and told her to go potty. Right then, Nathan unloaded in his diaper. I couldnt help but laugh. I know it was total coincidence but that gummy little smile told me he knew he did something funny.