So you constantly hear that your second will reach milestones earlier than your first. Was this true for you?

I feel like #2 is reaching physical milestones much slower! DD 1 was rolling by 5.5 months. By 6m she pulled up and sat unassisted. #2 has rolled tummy to back a handful of times but not consistently. She can sit up unassisted in her bouncer but not on the floor. No where near pulling up!
I was looking forward to starting solids in 2 weeks but not if she can't sit unassisted yet!

And just curious, not worried.