'It makes you feel like you are not alone': Expectant first-time mothers' experiences of social support within the social network, when preparing for childbirth and parenting

•Social support can strengthen expectant mothers' relationship with their partner.•Social support can contribute to feelings of calm and security about childbirth.•Social support can contribute to feelings of calm and security about parenting.•Social support increases understanding about childbirth and parenting.•Social support enables the sharing of experiences, according to expectant mothers.