Feeding less, sleeping more. How long will this last?

Hi. My boy is 8 weeks 4 days old today. He is sleeping well. But refuse to drink milk (formula), when given milk in between naps while awake. daily intake has dropped to about 400ml per day. Wondering how long will this phase last, as it is worrisome. Pls help, thanks!

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mine too at 9 wks.. i think it due to growth spurt or leap.