My 6 month old has been waking several times a night?

I think I can understand why you are asking that co'z I have the same experience. My son will be 6 months tuesday next week and started waking at night. He sleeps 8pm to 8am until recently when he will sleep at 9-10 and wakes at 5-6 and started crying. Before even when he wakes up, he never fuss and just play and then fall back asleep but right now since recently, thats not the case anymore. Co'z he will scream and scream till I get up to feed him. I don't know if it's growth spurt or he is teething. He will have his 6 month check up this tuesday and will definitely mention it to his doctor. Oh by the way, before when my little one will wake up I never give him bottle co'z he never demand to have it. He will just play and go back to sleep. but now, he will cry when he wakes up so I feed him.