Fighting cats, horribly scared kitten

I have 7 month old neutered male tabby, he's been spoiled ever since we got
him being treated like a child. We recently got a 12 week male un-neutered
kitten from a man who had been giving them away for free, who immediately ran
under our futon in the living room and has been hiding there for 2 days
without eating/drinking or using his litter box, he's simply terrified. My
older cat was curious about him, but seems scared...running and hissing when
he came to close. The kitten simply cowers in the corner under the couch
shivering. Now, I've heard to take the slow approach when intorducing new
cats, keeping them in seperate rooms but, I live in a smaller 1 bedroom
apartment and have a newborn so I can't allow the cats in my room, the two
cats can't realy help but be near each other. So what can i do to make the
situation more livable for everyone? Sonny the older cat doesn't seem to want
to have much to do with the little guy now. He just...doesn't seem to like
him. HELP! I couldn't bare getting rid of the little one.