New kitten eating other Cat's food

HELLO , I need help my new kitten is eating my zazzy's food, I live in a small apartment, the food is in the same room. I can't put Zazzy's food behind closed doors, as zazzy would not be able to access it. How do I stop this, I eventually want them on the same food, but want to slowly do that. If I put zazzy's food higher up will he realize it 's there , I tried that and even showed him it was there, but he went in like 1/2 hour later and was looking on the floor for his dish Was considering timed feedings, but I want them to eat whenever they want, I feel like it I only feed them twice a day it's not enough.. So my question is if I put zazzy's food up higher will he find it??

If you show Zazzy where his food is, he should definitely be able to find it.  Cats have a great sense of smell as well, so if he can't remember, he should be able to smell it.  I'm sure he would appreciate having it where the kitten can't get to it, because it may irritate him to find his bowl empty

As far as two feedings per day not being enough, many, many people only feed their CATS twice a day.  It certainly isn't enough for a small kitten, but once the baby is older, there is no reason why you can't transition them to scheduled feedings if you want.  And remember, in no time at all,the kitten will be able to jump up ( depending on how high you put Zazzy's food), so you will need to may other arrangements.  Seems to me my babies started jumping up on the bathroom counters around 6 months of age....maybe a little before.  Actually, one started way before the other because he was more agile.  The piggy couldn't manage as soon because he was overweight even as a kitten

If you incorporate wet food into the kitten's food,he may feel more full and less apt to sneak into Zazzy's food. 

Maybe some of these articles will help you when the time comes:

http://www.thecatsite.com/a/transitioning-free-fed-kibble-kitties-to-timed-meals

http://www.thecatsite.com/a/choosing-the-right-food-for-your-cat

http://www.thecatsite.com/a/how-much-food-should-i-feed-my-cat

Thank you so how often does a 6 month old kitten need to eat, because he is jumping up as high as he can on top of the kitchen cabinets now, so can't put zazzys food up anymore, zazzy is used to having food out all day , how do I do this again?  

I read the link you gave me but I really do not know how many calories per pound, thing like that, can anyone put it in more  "layman's" terms. Like how much dry ? how much wet? how many times a day? and will hairball control work for soft stinky stools? ( the kitten giving pumpkin not helping yet)..

WoW I never knew taking a  kitten in would be so much work ,zazzy was not a problem this one is SO CRAZY !!!

I have 4 cats, one an early "senior", a young adult, and two teenagers. I feed them dry for breakfast and wet for dinner. Their feedings are ~12 hours apart.

For their dry, I feed 1/3 cup each cat. When the kittens were a little younger (they're 10m now), I put down enough so they were getting twice as much as my adults. I never separated my adults from my kittens, as the kittens always seems to eat their fair share and the adults did, too. I found that scheduled feeding helped because they would each pick a bowl and eat quite a bit, and whatever was left over, anyone could nibble on until the next meal. My cats are fit (not underweight, not overweight), and this schedule and amount seems to work well for them.

For their canned, I give 3oz per cat at night, with the same routine as the dry food. Some parents don't agree with leaving wet food out for more than a couple hours, but I've never had a problem leaving it out until their next meal.

My cats are generally very active. My house is more like their racing track. :-) If they finish their dry food well before (say, 6hrs) the next feeding, and they are actively bugging me for more, I'll feed them a snack to tie them over. There are days they scarf down their food, and then there are days the food lasts them until the next feeding just fine.

As far as how many times per day the kitten needs to eat, if he is 6 months old, he can eat 3 to 4 times a day now and be just fine.  It's when they are much smaller that they need to be eating almost constantly   He still needs to be eating more than Zazzy though, because he's still a growing boy.

As to how much they need, you need to find out from the manufacturer how many calories are in their food.  Usually the bag will say how many calories are in a cup of food.  Sometimes the cans will say, otherwise, websites usually will tell you.  So once you know how many calories are in a cup of kibble, you have a starting place.   Let's say Zazzy weighs 10 lbs and is pretty active, so might need 25 calories per pound per day,  Multiply 10 lbs times 25 calories and you get 250 calories per day.  If you kibble is 250 calories per cup, then he would get 1 cup per day.  If the kibble is 300 calories per cup, then he would get slightly less then 1 cap (I can't do THAT math right now...brain isn't awake enough ), but hopefully you get the idea here.   If you are feeding both wet and dry, then you need to add the calories of both the wet and dry together to come up with the total amount of 250 (or whatever the total IS for your cats, and the kitten may be about the same even though he weights less)   So if you are feeding 1/2 can of Fancy Feast Classics, that's about 45 calories, so you would need to lessen the kibble by about 45 calories worth.  We could probably help you figure it out better if we knew how many calories were in the kibble you are feeding.

Also, I don't think hairball formula will necessarily help with soft, stinky poop.  That might be an entirely different issues.  Has he been checked for worms, etc.?  Is he on kitten food?  Any food changes can effect their stools?