HOW DO YOU KNOW IF YOUR POUCH IS STRECHED?AND HOW CAN IT GET THAT WAY

I AM ALMOST 4 MO OUT I AM SO AFRAID OF STRECHING MY POUCH OUT ,IS THER A WAY TO TELL, ALSO CAN ANY DRINK WATER LIKE THEY DID BEFORE LIKE TAKE LITTLE GULPS OR DO YOU HAVE TO SIP FOREVER?AND IM DOWN 50 LBS.

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