Without commenting on DVO, I always felt with ds1 that I 'didn't have enough milk', and he was mixed-fed (he was plummeting down the weight charts). Dd was borderline, but we managed, ds2 was a NIGHTMARE but again, with tiktok's help we managed (eventually) to up the supply, with lots of expressing etc.
Ds3 is a different kettle of fish. He lost lots of weight, certainly, but then, started putting it back on! This never happened with the other 3 - they CREPT up the charts, whereas ds3 not only was putting on decent amounts of weight, he was totally not of any concern to the mw or HV!
What was the difference with ds3? There were 2 differences I could see - firstly that he DEMANDED to be fed constantly for the first 3 or 4 days, which the others didn't do (and with ds1, who did do that, the hospital said he needed formula to settle him and I was too naive to argue). Secondly, I felt TERRIBLE after ds3's birth, in that I couldn't really walk anywhere! So all I felt comfortable doing was sitting on the sofa and feeding. With the others I was up and about, dashing around, and I'm sure that's a major difference in how successful feeding is. Perhaps it would have helped DVO to take a bit more time to be quiet at home, and not worried too much about Starbucks and the post office!