making your own mama cloth

[dfunk98]

i want to make pads like these for postpartum 

http://www.etsy.com/listing/64146693/muffies-burst-overnight-cloth-pad?ref=sr_gallery_30&ga_search_query=muffies&ga_search_type=handmade&ga_facet=handmade

they look so thin and trim.  other ones i've made have been very bulky.  i've used this pattern before and i really like it.  http://sites.google.com/site/shewhorunsintheforest/009

any ideas on how to make them thinner?  i was thinking of using zorb and 4 layers of flannel.  anyone have an idea on how that would work?