Most mothers in China feel they are happier after having a second child, according to a survey report released a year after the country relaxed its family planning policy.

The report, released on Sunday, was based on an online survey of about 4,200 mothers with two children. The survey found that about 63 percent of the respondents said they were happier after the birth of their second child, and 67 percent said they did not regret having another baby.

The survey of parents conducted this month was led by mama.cn, a website for Chinese mothers, and Muruai, a voluntary group based in Guangzhou, Guangdong province, that promotes breast-feeding. Of the 4,182 respondents, 4,151 were mothers.