Lewis & Short

infantārĭus, a, um, adj. [infans], that has to do with infants (poet. and post-class.).
Only substt.

  1. I. infantārĭa, ae, f., a woman fond of infants, Mart. 4, 88, 3.
  2. II. infantārĭi, ōrum, m. plur., sacrificers of infants, an epithet applied to the Christians, who were accused of offering up children, Tert. ad Nat. 1, 2.