i have a very windy baby and infacol didnt work at all. my health visitor suggested it may be useful to stop halfway during a feed and wind him, then resume feeding. he hardly ever is sick now and sleeps a lot better too. also try walking round with baby gently jigging up and down and patting baby's back. my baby is still windy (hes 5 months old) but its now easier to deal with because of these tips my HV gave me!
good luck, kirsty and alfie aged 5 months