One of the reasons I know this is that babies whose mothers have 12 or more weeks at home with them are more likely to get their vaccinations and their well checks in their first year, so those babies are more protected from deadly and disabling diseases.
Saya tahu ini karena ibu yang menemani bayinya selama 12 minggu atau lebih dapat memberikan vaksinasi dan melakukan check-up di tahun pertama sang bayi, jadi sang bayi lebih terlindungi dari penyakit berbahaya.