Vinod strangled four-month pregnant Pinky, 24, while she was asleep late Saturday night at his house in Bajrang Enclave in Najafgarh area in west Delhi, police said.
The suspect surrendered before police Sunday morning. Pinky's parents alleged that he used to beat her up for dowry, police said.
"He told us that he had a heated argument with his wife, after which she went to sleep. He later strangled her," said a police official.
The couple had a three-year-old daughter, police said.