Introduction
In March 2020, the WHO had declared the novel COVID-19 as a pandemic worldwide (Motherhood transition is the challenging period during which women need to acquire various parenting knowledge and skills, adapt to the changing family relationships, and accept the maternal role (As a significant predictor of parenting outcomes, the maternal self-efficacy (MSE) is defined as the beliefs of women having about their capability of the organization and performance of various parenting tasks (Previous studies indicated that a larger proportion of Chinese primiparous women appeared to suffer from PPD in comparison of women in Western countries, because Chinese mothers in the traditional culture had been given a high expectation of the maternal role, and had to cope with the delicate relationship with mothers-in-law (In regarding to social support, Chinese primiparous women were reported to acquire insufficient social support after childbirth, and particularly lack adequate informational support and evaluative support from health professionals, such as professional parenting advice and instructions (Before pandemic, some traditional face-to-face interventions were proved to be effective in the improvement of maternal parenting and mental wellbeing (Research found that internet interventions in health field can contain more tailor information, reach larger groups of participants, provide more anonymity, and reduce financial and time cost in comparison with face-to-face interventions (At present, approximate two-thirds of Chinese people were reported to access the internet 