My DD is 16 weeks tomorrow, I went and weighed/measured her this morning - it's been 3 weeks since the last weigh and she's only put on 220gms & grown 2.5cm (5.35kgs & 58.5cm) in that time. Could it be a growth spurt or is she not getting enough milk?

During the day she feeds every 3-3.5hours, with cluster feeding in the evenings and then sleeps 9-10hours over night (9pm-7.00am), she has been doing this since about 5-6 weeks

She doesn't look skinny, has plenty of wet & pooey nappies each day and is a happy & placid baby the majority of the time.

Should I be looking to add an extra feed or two is during the day? Or is there anything I can do to enrich my BM?