Oh it is definitely normal. MOST transitions (Not all) last about 2-3 weeks where the child wants to be velcroed to you and will cry as soon as you are out of sight or touch.
It takes time for someone to feel safe and comfortable with you and to know that their parents come back every day.

It's hard to find a balance between holding him to reassure him and teaching him independence...it is a fine line.

Good luck though....eventually the child will settle in