Baby sizes?

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I have a 7 month old. In onesies he’s size 6 months. In sleepers he’s size 6-9 months. And in pants he’s size 12 months (a little long but nothing smaller fits his waist and legs). Just curious to see if anyone else’s babies are different sizes or not 🤷🏼‍♀️ mine just has some chunky thighs 😋