Is a Costco membership worth it for two adults and a baby?

Yes — for two adults and a baby, a Costco membership is often worth it if you’ll use it for diapers/wipes, groceries, household basics, and especially gas. A basic membership at about $65/year only needs to save you roughly $5–$6 per month to break even, which many small families can do with just a few recurring baby and pantry purchases.

Best rule of thumb: get the basic membership first. Upgrade to Executive only if you expect to spend about $3,250+ per year on eligible Costco purchases, because the 2% reward then offsets the extra cost.

It is most likely worth it if you:

• Buy diapers, wipes, formula, snacks, paper goods, detergent, and freezer staples regularly
• Have space to store bulk items
• Live close enough that you’ll go at least once or twice a month
• Can use Costco gas, pharmacy, optical, travel, or big-ticket appliance/electronics deals

It may not be worth it if you:

• Have limited storage
• Don’t drive much or don’t have a nearby warehouse/gas station
• Prefer small weekly grocery trips
• Often waste bulk food before using it

My recommendation: start with the basic Gold Star membership for a year, track whether you use it monthly, and only upgrade if your annual eligible spend is clearly above the Executive break-even point.