My dd is 4 weeks old, she weighed 7lb at birth and is now 8lb 4oz, i make her 4oz bottles at each feed but she only drinks 2-3oz of it then an hour later she will drink another 1-2oz but she doesnt do it after every feed sometimes she will drink the whole 4oz and sleep for 3-4 hours, shes a happy baby and it seems to be enough for her but im just wondering if its normal.