A woman is in police custody after a baby is found dead inside a Manhattan restaurant Monday. 

Police say the 35-year-old woman went into the bathroom of a 5 Boro Burger in Midtown with a one-year-old and was in there for an abnormally long time. 

That's when employees became concerned and unlocked the door.

They say they found the woman with the child on her lap. The baby was foaming at the mouth.

The child was taken to the hospital and pronounced dead. 

Police say the woman hasn't been charged yet. 

Her relationship with the child remains unclear.