Viet, it does get easier with one child...I found that by 3 or 4 months into it, leaving the house with the baby was a lot easier than it is in those early days. It literally starts to become second nature, and it will feel really wierd when your child ISN'T with you. You'll feel like you're missing your hand, or something! It's the two children thing that's getting me all anxious at this point.
Just, I can totally see what you mean about the toddler thing. Hannah just turned 14 months today, and she's definitely losing the baby stuff, and moving on to the toddler stage. She is what some would describe as a "spirited child." Points and hollers at the top of her lungs at things she wants, RUNS, RUNS, RUNS, wants Mommy one minute, and then total independence the next. I'm starting to see some pre-tantrum-type behavior also, when things don't go her way. She still basically has no verbal expressive language, although she demonstrates that her receptive vocab is great...and this lack of verbal skills often can create some behaviors, also. I'm hoping that by 17 months, when Oscar is due, that she has some words, and can communicate with us a bit more effectively.