4 month old help!!

My son is 4 months old..I pump and give him bottles due to him not latching (labor of love!!) Lately he isn't satisfied with how much I was giving him so I tried increasing by just a half ounce and then a full ounce..he's up to 5 ounces and doesn't seem satisfied with that but that is all I pump within a 2 hours period. I don't want to give him formula but is there anything else I can do/give him to satisfy his hunger?

Also,does your 4 month old refuse a nap and get fussy?? Mine does and I have no clue how to get him to nap..I've tried everything.

Thank you in advance!!