A Long Island woman vanished with her 2-year-old daughter after saying the two of them were going to a doctor’s appointment, police said Tuesday.

Kristen Moore, 41, and her baby, Alyssa Scott-Moore, left their home in Dix Hills at around 4:30 p.m. on Monday — and never returned, Suffolk County Police said in a news release.

The mom, who may be driving a gray pickup truck, said that she and the toddler were going to a doctor’s appointment, according to cops.

She has previously lived in Bay Shore and has family in Ohio.

Police couldn’t immediately provide more information.