Oh SJLY, as a Mum that broke my heart! My children were 11 & 13 first diagnosis in 2011. Certainly for a toddler is so very different. I'd imagine the most he would understand is you are not well as you are in hospital, but maybe the biggest thing for him is you are not home and gosh, I know at such a young age, their Mum is their World, so his world is turned upside down. So its so so normal that he'd be out of sorts and upset. I would try and keep things simple, that youre not well, but you are going to be and you are going to be home soon. Of course someone so young, he just couldnt understand the depth of it all, lots of cuddles as seems naturally he's suffering separation anxiety. All so normal. So hard for you, being a Mum. They certainly are resilient, so just love him through it. Wishing you healing and a to be home soon. Hugs Melinda xo