I think one of the best things to give a child is a sibling (thats just my personal view. Some are happy to have just one child and thats fine too if everyone in the family is happy with that).
When the second one comes along, the whole family dynamics changes dramatically. Toddler has to learn to adjust from being the only one to become a sibling. With a sibling of course comes sibling rivalry and love too.
Its funny how everytime someone wants to pick baby up, toddler would appear magically before the outstretched arms. She would take away baby's toys away from him, push him and tell him to go away but at the same time she loves her little baby brother too.
One day when no one was watching, I saw that she had accidentally hit baby's head with a rattle she was trying to give/snatch (not sure which) from him. She quickly reached down to kiss his head and said "Sorry. Sorry." She also likes to play "mummy" and tuck baby under his blankets and pat him softly on his back when he is sleepy.
Now if only I can provide a little sister for her too. I love my sisters, one 5 years and the other 8 years older than me. I think they're great. Better than any girlfriend and our sisterly relationship will last until the ends of our days.