This one happens in the episode where Darlene and David bring home the baby and everyone is going in to where the baby is and talking to her. You see Jackie come in with Jerry who is Roseannes youngest kid and Andy who is her son. Her son andy looks to be around 8 or 9. Well if you remember either earlier in the season or the one before when the family went to disney world, both andy and jerry were only babies. How is it that Andy grew so much faster than Jerry?