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Yes, I understand that I need to apply a ITIN (form W7) for my baby when filing tax return. The things is, because I file tax return separately with my husband (as I husband don’t need to), so that mean I cannot file W7 for ITIN. Is that’s right? 
Another question is, if my baby doesn’t have a ITIN, can I claim Dependent FSA for daycare tuition fee?