Re: "She'll be a delayed crawler/walker because her diaper is so big"...
Your family sounds like my MIL. She drives me insane. She has yet to comment on the bulkiness of the dipes but did inform me that since she bought me two packs of sposies the othe day that I didn't have to use "those diapers". I don't think she likes it but guess what...MY BABY MY DIAPERS!