Hello and thanks for all your input!
I really feel that using the constitutional is indicated also, especially since in this case the remedy fits very well (Phos). The remedy is not in the alopecia in children rubric, however this child definitely does not fit baryta or nat-m.
I will give you some info on the case and you can let me know what you think!
This 4yo boy made very good contact with me in the clinic, very friendly and smiling, not shy. Very affectionate with his mom in the office, hugging her and kissing her.
THe alopecia began when he moved to Canada from France and he did not know english at the time. He loves to be with other children, and because he couldn't communicate, this was difficult for him, and his hair began to fall out over 3 months and now he is almost completely bald. He tries very hard to communicate with the children and really wants to play with them.

Afraid of thunderstorms and loud noises, very sociable and affectionate, not shy, smiles a lot. Very charming child. He loves to drink Sprite and also likes milk. Has a history of eczema on cubital crease, steroid creams used.
Warm body temperature though not significantly so. Quite thirsty for cold drinks. Good appetite, normal stools and urination.
Sleep is good, no position noted by mom. Stomach flu every 2-3 months with vomiting, no cause of this can be determined.
No other significant symptoms were elicited on interview. Hair loss is central, at fringe of scalp there is more hair. The night before the hair fell out, he started crying and was urinating a lot. What upsets him most is that he can't talk to and make friends with the other kids because of the language problem. He still will try to interact, however.

My impression was Phosphorus most strongly....especially with the communication issues(Scholten). I also ddx'd Puls, but found it not to be as strong a remedy as Phos for alopecia and constitutionally for him(he is very outgoing). I really didn't see too much to indicate sulphur or tub or vinca minor in this case, but if you have any suggestions I would definite appreciate any!! Thanks again!!