C.K.
i have a two year old with spina bifida. Its alot different but i wanted to suggest a children's book about down syndrome for the other children. I am very close to my nieces and when i had emma they were only 3 and 2. I bought about a little girl who was alittle different and it showed her braces and that she went potty different and such things and i think after reading it to them and them asking questions i know at least the 3 year old grasped that her cousin was different. Now she will tell me things about emma and tell her friends too. So i just wanted to suggest that maybe your friend should get a nice book to explain to her other children that this child will be different.
best of luck to you and your friend.