Hello, I'm an expert in infant clothing sizes. When it comes to choosing the right size for a baby, it's important to consider not just their weight but also their length and the style of clothing you're looking for.

For a 10-pound baby, which is a bit above average for a newborn but still within the typical range for a baby up to 3 months old, you would generally start with Newborn (NB) or 0-3 months size. However, if the baby is longer in length, you might need to consider sizing up to the next size to ensure there's enough room for growth and comfort.

Clothing brands may vary in their sizing, so always refer to the specific size chart provided by the brand. It's also a good idea to measure the baby's length and chest circumference to make the best decision.

Here's a general guideline:

- Weight: 10 pounds
- Size Range: Newborn (NB) or 0-3 months
- Considerations: Length and chest measurements, brand-specific sizing

Remember, babies grow quickly, and it's better to have clothes that are slightly larger rather than too tight for comfort.

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