Can 4 week old baby have juice?

No: Infants should realy not have juice until age 1 year. People for ages have given juice at a young age, and many still do. However, it's best to stay away from fruit juices until age 1. The biggest exception is in times of dehydration, at parent could give an electrolyte solution that might have a juice flavor.

I wouldn't: Juices are an oversold product that provides plenty of sugar & sweet stimulus to babies. They may program the brain to crave it in excess over a lifetime,resulting in obesity.Apple in the form of a sauce/orange as a wedge are less processed & give a blend of protein and fiber that are better for babies but after 6 months. Juices are basically like giving a kid a coke.