C.G.
one thing you'd have to think about is if you will be breastfeeding him at 11 months still. if so, then will he take formula and will you be able to pump while you are away so that you can continue to feed him when you return. he might have some tough nights for your husband, but he will not be traumatized. he'll just be extra excited when you get home! at 22 months he is basically almost 2 years old and he will most likely be in his own bed and also not breastfeeding(unless you plan to do both that long...not sure, you didn't mention that)but either way, it would be easier for you and for him the older he is. but if you decide to leave when he is 11 months, he will be fine. he'll never remember it later in life. it just might be hard for the sleeping and feeding issue. good luck in whatever you decide.