Pacifier sizing

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I’ve been googling away but can’t really find the ‘right’ answer.

My daughter has 0-3 month Philips avent soothie pacifiers, and she’s 3 months today. I feel like she’s able to get more of the pacifier in her mouth recently, so I went to order her the 3+ month one. From what I saw in the reviews people were saying that it’s the same size just harder for when they have teeth.

I also saw some say the nipple is longer so they can’t fit as much in their mouth.

Does anyone know anything about this? She doesn’t have teeth or signs of teeth so I don’t want to get her the next size right now if she really doesn’t need it. I’m so close to calling the company and asking them or waiting for her 4 month check up to ask her pediatrician 😂