Plaintiffs in federal court in Newark say Gerber Products Co. makes unproven health claims about foods that raise the bacteria level in a baby’s digestive tract and charges more for them.

The putative class action, filed on Feb. 13, takes issue with Gerber’s contentions that prebiotic and probiotic additives in certain varieties of its formula and cereal will promote digestion, support a healthy immune system and provide benefits similar to breast milk.