I think women, on average, already "know enough" to raise kids. IMO, it's more of a sociocultural problem stemming from consumerism, hedonism, extreme individualism and "prolonged adolescence", all in a cultural context that disregards the value of family and deeper human connections and sees childrearing as a burden that has to be scheduled around/after more important things like travelling and partying. This is also fueled by negative, often traumatic experiences in childhood, which will often kill one's hope in the future and one's perceived competence in successfully raising a family. It's hard to consider it a purely/mostly economic problem as significantly poorer societies and comparatively poorer immigrants in Western societies still have more children and at earlier ages.