DS1 was a dream - 6-7 hours from 3 weeks, 10-12 hours from 3 months.

DS2 didn't sleep much or regularly until around 9 months.

Sorry!
Lol! We were pretty similar here!

DD1 slept 9-10hrs staight from 9 weeks, 12 hours from around 3 months. Sure, she'd have her bad nights when she was teething, had a night terror or was sick but all in all she slept well at night and still does.

DD2 slept really well initially too but it all went pear shaped when she started teething around 5 months. This continued until almost 9 months and I was up most night with her at least 5 times, often 8 She did eventually sleep through around her first birthday and it became consistent around 13-14 months. Naturally she still wakes when she's unwell or teething. Unfortunately she's recently started experiencing night terrors too so I anticipate another year or so of them interrupting sleep every now and then.

To cut a long story short, lol, my girls have been quite different sleepers except that they both fell into their own routines around 5-7 weeks of 3 blocks of sleep overnight (with 2 feeds) so it was 5hrs, feed, 4hrs, feed, 3hrs, up for the day. They both just naturally did it.