The large number of women of childbearing age in Shanghai and the rise in migrant residents have seen the city's population surge in recent years, experts said on Wednesday.

The city's birth rate has been on the rise since 2009, with 226,100 babies born last year, up by 25.6 percent year-on-year, Shanghai Population and Family Planning Commission announced earlier this week.

Among the newborn babies, 121,100 were to registered residents in Shanghai.