At 19.5 months old, Aiden can do the following animal sounds. Cow (mooo), sheep (bah), horse (neigh), dog panting, duck (gaga), monkey (wowo), owl (owl), dinosaur (roar), lion (roar), fish, pig, bee and cat. He can do a few sign languages: please, ball, book, eat, yellow, outside, more. The words he has managed are: please, outside, ball, book, water (wawa), milk, more, dog, eyes, nose, daddy, mama, owl, car, bus, byebye, bird, NO (his favoriate one), duck. He started saying two words together such as byebye car, car book, mama car, my ball. Also he has mastered all his Melissa & Doug's puzzles including animals, transportation, shapes and cars. Go Aiden!