I didn't know much about why you would choose different shape pacifiers, but I've looked into it more and I think I know more now. Basically breast feeding babies prefer the round shape. I guess it reminds them more of a nipple and is more comforting. And that is true for our baby. But the Orthodontic pacifiers should be used once baby gets teeth. It promotes teeth growth better. Therefore you kinda have the choice in starting out with the orthodontic and getting the baby used to it right away, or switching to the orthodontic once they get teeth (or, I guess, assuming they won't need a pacifier by the time the teeth are coming in).
I like the all silicone design, but I'm a little undecided about the one piece design. It's harder to grab onto these. I guess the one piece is easier to sterilize, and silicone is one of the safest materials. I just think it could at least have a silicone nub of some kind to grab onto.
In the end, I can't tell you which shape your baby will like better. But as long as the lack of handle doesn't bother you, these are well made and safe pacifiers.
