My husband and I and our two children (aged 1.5 yr and 7 months) had our global entry interviews in December and were all approved. At the interview, the kids did not have fingerprints taken (this was at the DTW location).
We just came back from Asia on NRT-SFO last week, and couldn't figure out how to get the kiosk to recognize the kids. My husband and I did ours just fine. We got my 1.5 yr old's hand down on the fingerprint scanner, but it wouldn't accept them/couldn't verify (obviously - I don't think his fingerprints are in the system!). After several failed attempts to figure it out, we just took our two adult GE forms to the CBP agent and explained the situation. He had us fill out an old school customs form for the kids and marked it "2," as PP mentioned.
Does anyone know if there's a way to get the kiosk to process infants? They are members of the GE program, so....