My DD says lellow for yellow too. When my youngest was born and still breast feeding she had the yellow poopies. So when I would change her my 4 year old would come up and say "It's got lellow dodo's?" I I would say "Yes it has lellow dodo's." then she would pat the little one on the head and say "Congratulastions! You got lellow dodo's!" LOL
ETA: once the little one got a little bit of the runs and it was slightly grey in color. When the 4 yr old saw it she asked what color that was. (She has almost all the colors down but the ones you don't see often she's still learning.) So I explained to her the baby has a little bit of the runs and it just happened to be grey. Well she herself got a bit of the runs and came to me from the bathroom with her panties around her ankles saying, "Mommy! I have grey dodo's!(it wasn't grey!) Sussume the susition!" When she was learning to potty train and neede help wiping I would tell her to "assume the position" which would mean to bend over and touch the ground so I could help her wipe. She does pretty well wiping on her own but if she has loose BM's I still need to help her, other wise she get's it all over her hands! LOL!