A five-month-old baby was found dead at a property in Motueka last night, police say, and a homicide investigation is ongoing.

A 41-year-old woman was also found seriously injured at the Memorial Drive address, and was flown to Nelson Hospital where she is in a serious but stable condition.

Emergency services were alerted to the incident at 8.40pm yesterday and the police have been examining the scene today.

Police said they were speaking with someone in relation to the death, but so far no charges have been laid.