Koala Bear-by

We brought Immanuel to the National Museum this afternoon and then to Go Go Bambini.Immanuel has been extremely "clingy" of late and simply refused to be left alone.He doesn't even want to be carried by anyone else if I'm around.When we brought him to GGB last friday,he seemed terrified.He din even wanna touch anything and juz cling on to me like a koala bear all the time.He was not like this the first time when we went w Dawn and Dylan.So today,we bring him back to GGB again and he behaved the same way.When I tried to put him down, he'll start whining non stop.Its only when there's no one else in the play area that he starts
to explore the surroundings.
Now I'm starting to worried if I'm
"under-exposing" him to new people,children or
new places. But I thot I've been bringing him out
almost every weekend for hours!!!!
Anyone w any advice?