An innocent 2-year-old boy and his mother were hospitalized Wednesday after they were pepper-sprayed on a Bronx subway platform, police said.

The baby and his 30-year-old mom were struck by the pepper spray inside the 149th Street-Grand Concourse station by a man who was aiming the chemical at two women he was fighting with, according to cops.

The man and two women had been arguing on the northbound 2-4-5 train platform when he whipped out the potent spray.

After missing his intended targets, and instead hitting the boy and his mother, the man fled on a train, police said. The two women also ran off.

The mother and son were rushed to Lincoln Hospital in stable condition.