Yes, why not, if you have no intention to feed fm, and is the only caregiver, no need other ppl to help u look after ur boy, u can straight go to "straw cup"!
I dun recommend sippy cup, it's more difficult to use, and usually DL tend to master the straw cup faster too. Hence dun waste ur money on sippy cup.
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Mama bear of 1 handsome little heart throb