By what age do babies generally develop full sensitivity for taste?

Well tastbuds for babies are there at birth but not until the baby is 5 months old that the baby starts reacting to salty foods, 3 months and the baby's tongue has grown thats normally when the baby starts putting things in their mouth 6 months you should start feeding the child solid food and thats when the taste buds fully develop however your taste buds change every 7 years

What? are u trying to do a genetic test?

That's  a project for you to do. btw your teacher probably uses a plagiarism detector and if you do copy anything on this site she/ he will find out and instead of getting a good  or bad grade you'll  get a 0 no exceptions, and they'll  probably call ur parents. so do some research ask friends and fam to you.