My baby is 68 days old , he would not fall sleep ,i have used my all method that walk ,sit ,and talk to him ,who can help me! thank you?

Your pediatrician : can tell you if he's healthy so you can establish consistent nap & bedtimes. In low light, read, rock, feed, wipe out his mouth with a soft cloth after the last feed. Then put him on his back in his own crib in his own room, drowsy but awake, without pacifier or bottle to learn to self-calm for sleep. Sadly, you can't do it for him. Calmly repeat if he cries for more than 10 minutes.