Difficulty falling asleep

My LO is 2 months old and the last couple of weeks she has trouble going to sleep at night and staying asleep. We put her down around 8 pm when we notice she is getting sleepy and cranky. We have started to establish somewhat of a bedtime routine where we give her a bath, put her in the swaddle (halo sleepsack usually), give her milk and make sure she burps, and then once she eventually falls asleep in our arms we will put her in the bassinet. It seems like she’s out cold for at least the next few hours until her next feed but a few mins later she’s wide awake! Then after, it takes FOREVER to get her back to sleep. I have to rock her, walk around with her, sway, sing a lullaby, etc etc. Every night this has been happening and I’m not sure why because before it was so easy to get her to sleep. It’s like she’s almost fighting the sleep and the more tired she gets the harder it becomes.

Anyone in the same boat or can offer advice? I really want bedtime to be a little easier than this!