My 1 month old son is drinking (possibly) too much formula.

I was unable to breastfeed and we started him off on NAN HA GOLD 1 while I was in hospital.

Currently he is taking 6-7 feeds a day and drinking anything from about 130ml to about 170ml in a feed and now is looking like he wants more!

He was a big baby at birth (weighing 4 kilos) and is now about 5.4kgs.

Please help as I don't know if I have him on the right formula or how to slow his feeding down!