china's TFR comes from the one-child policy. now abolished, the effects still linger. and it also comes from many people not getting married at all mostly because of financial concerns, or maybe women not interested in having a family at all.

what works is that when people get married, many marry young and when they have children the grandparents are around and help as described. i haven't seen anyone with children where the grandparents were not around to help.