I always found Elijah would get more obsessive just before he would come down with something, if he wasn't feeling well, teething etc. Thank god for the boob - he'd never eat anything when he was sick and would never have medicine when sick. Thats what kept me going - knowing I could help him in a special way that didn't require medicine and he'd have the comfort of being with me too. They really do seem to increase/decrease with their needs, be it emotional, physical etc.