for the average joe like me, this is how the typical monthly expenditure for my son (he is 3 now):
1. nursery (newborn to 2 yo= $280, now= $230 - not including $3 per hour overtime is i take him later than 6pm)
2. disposable diapers = uses 2 jumbo pack per month (always buy at promo price anywhere there is one..last time use the red huggies but since the price is getting ridiculous, using petpet now = $70
3. milk powder = breastfeed until 1y3m, after that give dugro. basically 5 pack per month = $100+
4. clothes need to buy each months since at early stage they grew faster. usually buy jusco branded cloth for nursery use = $50+ per month
5. others such as bottles, toys, etc = price varies...

and it is for one child only...at least $450 per months..usually around $500