My son is 20 months now and although I know periods of separation anxiety are normal, he is more the other way around - there have been patches when he's 'easier' and will entertain himself for a short period (I'm talking 5 mins not half an hour!) but in general his default setting is to be completely obsessed with me.
Some days I can't even shower without him crying throughout- I do because I don't want to be smelly! But even though he has so much if me it never seems to be enough. We co sleep from around 11 or midnight as he won't be put back i his cot then and are still breastfeeding. I can't imagine how I could ever wean him tbh, he loves his milk so much. I am at home with him at the moment so he has me every day, but even when DH is there he isn't that interested in him and will bother me for attention instead. This is obviously hard on DH who would like more affection, and me who needs a break!
Funnily enough he will play happily with my parents, but if it's DH, me and him at home he just wants to be with me. Does that sound normal? Maybe I should have encouraged him to spend more time away from me, but haven't had the opportunity as DH works long hours so we're together a LOT.
I think DH is starting to think there's some kind of problem and DS should be more independent by now. Though that doesn't seem to extend to actually taking over from me much to give him any practice.