Curious

Our first was crawling by 7 months. I look back at pics and videos of her and she just seems so

much further along than our current 7 month old! I know not to compare, but I can’t help but wonder is it normal? Our 7mo is soooooo calm, sweet, never cries, loves to eat...just overall an easy, chill baby. But she just lays down, does tummy time, will sit up with some assistance...briefly unassisted. Our first was super active, never stopped (still doesn’t), cried a lot, crawled by 7 months and walked by 11 months, etc. Anyone else experiencing a lazy October baby?