If 1 year old baby has three cafe au lait spots, does this mean nf1? how likely is it that he'll get more?

Not necessarily: Many people who do not have nf have a few café-au-lait spots . Usually start appearing in infancy.If a young child has five or more, at least ½ inch or 15 mm in size post puberty look for other signs such as neurofibromas — tumors along skin and lisch nodules, tiny, noncancerous tumors on the iris (the colored part of the eye). Consult physician to better assess individual signs for diagnosis.