Dd2 is nearly 3 weeks old and still isn't back up to her birth weight. She was 9lb at birth went down to 8.3 up to 8.9 then 8.12 and then 8.15 as of yesterday. (Dd1 took nearly 5 weeks to get back to her birthweight).
Dd2 is a sleepy baby but I am waking her up to feed - am trying for the recommended 8-12 feeds a day.
Also, dd2 was born by a c-section, her nose was pressing on my pelvis and she is very 'mucusy/snorty'. The GP has prescribed some saline drops to squirt up her nose before feeding and this is helping.
I would like advice re should I be trying to build up my milk supply so dd2 puts on weight faster? If so advice please. 
Or should I just carry on as I am as dd2 is doing plenty poohy/wet nappies, seems a happy thing and is getting plumper and putting on weight although slowly.
Any advice will be gratefully received. TIA 