I can only speak for Delta since that is who I usually use. Anyway, declaring an infant in arms allows you to take a child under two on board without an extra charge. If you have a baby item ie stroller, car seat you can gate check it for no charge. Some times if you sweet talk the right counter agent they will check your baby item at no charge. You can carry on two items per paying passenger and if you aren't medallion they charge you for baggage checked
Hope that helps
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