My son is currently 6 weeks old and a very hungry boy. I only managed to (partly) breast feed him for 3 weeks.
He has 100ml of Cow & Gate ready to feed milk every 2 hours, day and night.
Two days ago we started giving him Cow & Gate hungrier baby milk, which according to our HV should be done gradually starting with one feed per day.
I haven't noticed any difference with that, maybe we need to give more time until we see proper results.
At birth he was 3.3kg / 7.7 lbs, now at 6 weeks 4.1kg / 9 lbs. So he was/is normal weight and length.
I also had a severe hip pain during the last 4 months of pregnancy so haven't had a proper nights sleep in about 6 months. So mummy is a bit tired :)
How often and much does your similar age baby eat?