Do you mean "holding like a baby" as in cradling the rabbit? So the rabbit is on it's back in your arms? (with head supported of course).
I used to do this with my big male rabbit (Snowy)... he used to love being held like that! He used to lay in my arms for ages and go to sleep. Someone once told me it's because being in that position makes them relax or something... not sure if that is true, but I know my Snowy would totally flake out when being held like that. But, he was an extremely friendly rabbit and loved to be held/cuddled and you could do absolutely anything to him. So perhaps that's why I could cradle him like that. He was more like a dog than a rabbit, he was the best. Such a big boy too! He was massive