Welcome to HCM
First of all I would like to inform you that reflux in 7 month old usually not a disorder rather than a normal thing(otherwise diagonosis by by upper G.I endosopy).The first step of manage of reflux is to modification of food which often relived the condition.As your baby is more than 2 years he should be taken mostly solid food and should take frequent rather tan full stomach.Another thing is that Lansoprazole
) usually not given for such long time.
So i would request you to go to pediatrician
for a review of the condition.