I was under the impression that hungry baby milk is for when your baby is chugging back big bottles of first stage milk at frequent intervals and still seeming hungry, so you move on to hungry baby milk to hold off weaning them a bit longer?
Thats how I used it when DS1 was little as he was a hungry bugger.
DS2 (17 weeks) is only having reasonable small quamtities of milk per bottle and only feeding every 3 or 4 hours, but he does still have a night feed.
MIL reckons hungry baby milk is for babies like him that still wake up in the night as he should be sleeping through by now or starting to wean. He's nowhere near ready to wean and is bang on his centile for weight gain so surely if I put him on hungry milk then he will have less in the day as well and then wont he be having too little?