Well, my 3 are very different and they were different from day 1.

#1 has *always* been a good sleeper, and still sleeps longer than my toddler. She has *always* been very talkative, and *always* been stubborn and has to be right. The only things that have changed is her vocabulary has increased something severe so the arguments have been getting ever more pedantic as she's got older.

#2 has *never* been a good sleeper, and is still a grouchy mc grumpyface when she's tired. She's also a mega-observant thief and has been since she could crawl. We'll see how that goes.

#3 is an 'easy' baby, as in its not hard to get him to settle, he's a happy little thing and doesn't cry often. He's quite placid, which is good because #2 keeps climbing on him and getting in his face. We'll see how that goes too