Hi, Alice~
Almost every 'second child' is a lot more 'laid back' than the first. One reason is that we want our FIRST child to mirror our WONDERFUL parenting skills to the world and we spend lots of time with them and lots of intense teaching. Girls are almost always more verbal than boys, but even girls have different personalities and sometimes aren't 'talkers' (our 20-yr old 'baby' girl still isn't a star converstionalist although her older brothers and sister all are. Their dad isn't, either).
Personality, birth order, and other factors come into play. Also, with the second child, s/he has a built-in playmate (the older sibling) and Mom doesn't spend as much 'one-on-one' time with him/her as she did with the first one. Our oldest (daughter) said so many cute things that I remember. I'm sure her first sibling (boy) said lots of cute things, too; but because they were entertaining each other, I was free to be out of the room & missed a lot. Bummer! (Nice to not be so 'tied down' every minute to entertaining one kid, but not so nice to miss the 'good stuff'! LOL
Our oldest daugher has 3 kids (boy, boy, girl), and the second boy didn't walk til he was 15 mo old, but he talks up a storm. (He'll be 3 in Jan). They just do everything at different paces.
About the pacifier -- he's old enough to start only giving it to him when he specifically indicates that he wants it, then put it out of sight when he's not involved with it. Don't make a big deal of it, just let nature take its course.