My 4mths old baby used to sleep at 8plus to 9pm and she wake up at 6 or 7am everyday. Tried dragging her sleeping time by playing with her but can't, any solutions?

Babies at 4 months old need a lot of sleep as much as 14-16 hours of sleep including naps. I would say get your baby to bed earlier between 7-8pm if possible. It really depends on what time your baby wakes up from his last nap as well. The awake time generally should not be longer than 2 hours at this age.