Let's face it; babies never stop moving unless they're asleep. Dressing them is a hassle unless you distract them.
Steps
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Don't give them something that will get in the way. If the baby is about six months, or can hold things by itself, then hand it a toy. They usually stop squirming and focus on the new toy.
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If the baby is older, give it a tooth brush. Babies tend to want to be independent, so when they brush their teeth they normally become absorbed in the toothbrush and stop trying to get away. Put a little tooth paste on it and you've bought yourself time.
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Hurry. Don't go too fast, but don't be a sloth or the toy will become boring and they will lose interest and squirm again.
