5 month old suddenly not sleeping until 10pm

[PandaMa]

Hi guys. My 5 month old has just recently become difficult when it comes to bed time! His usual bedtime is between 7pm and 7.30pm, but all of a sudden he goes to sleep after bath and bottle like normal but will wake 45minutes later and not settle back to sleep until 10pm. Nothing routine wise has changed and once he settles at 10pm he can be asleep until 8am the next morning. Any ideas why he's decided to change schedule or how to change it back?

Hi sympathies mines been doing the same im hoping it's a wonder weeks leap 5 (according to the app will end soon). We just keep trying the same routine, one night this week he stayed asleep 😁 but have been having a heck of a battle to get him back to sleep for weeks. My only advice is eat when they go down first time or relay with your oh. It's only a Pie a (We hope)

*pie phase lol