When to start first food/solid food?

Hello mummies! I'm a first time mother and my daughter is 5 months old. I was told by old folks that I can begin to introduce baby's first food (Like Gerber's kinds) or cereal nestum mixed with milk. However, their packaging stated that it's suitable for 6 months age and above. I'm afraid to start soft food for my baby because I was told that there would chances babies will get colic. However the first food from Gerber's are suitable for ages 4 months and up. Do i try that first?