There is no need for toothpaste to be used initially on babies.  However, for toddlers who want to imitate their parents, use only a tiny amount of non-fluoridated paste (amount smaller than a pea, since infants and toddlers often swallow toothpaste). Keep using the non-fluoridated variety until your child can spit it all out, because swallowing too much fluoride can cause fluorosis, a discoloration of future permanent teeth.