Just had a newborn. On the 'one-time' buy things such as car seat, strollers, playpen (which i forsee might last long for at least 2 years), spent around 4k.

On the monthly expenses, formula milk + diapers + daycare (mine 1.5k) will come around 2k/m for the first year. Additional 200-300 a month for clothings/feeding bottles.

So, should be around 2.5k a month.