Baby Swing Fit & Longevity Calculator
Before you spend on a swing, estimate how long it is likely to fit. Enter your baby's age and weight, or tell us you're expecting, and the weight limit printed by the manufacturer.
How the estimate works
Two things decide when the swing stage ends. The calculator works out both and shows whichever arrives first.
- Weight. Your baby's weight is projected forward using the average figures in Mayo Clinic's “Infant growth: What's normal?”: about 1 ounce (28 grams) a day in the first few months, about 20 grams a day from around four months, and about 10 grams a day from six months. The projection stops at the weight limit you select.
- Development. Manufacturers tell parents to stop using a swing once a baby can sit up unassisted or tries to climb out, even under the weight limit. Many babies reach that point at around six months, so the calculator uses six months as a planning point.
Babies grow at very different rates, and every swing has its own limits. Treat the number as a way to plan a purchase, then follow the manual for the swing you choose.
Not sure which type of swing to look at? Try the Swing Finder
Calculator FAQ
How does the calculator estimate how long a swing will fit?
It compares two things and uses whichever comes first: the time it would take a baby growing at an average rate to reach the weight limit you select, and a developmental planning point of about six months, because manufacturers say to stop once a baby can sit up unassisted or tries to climb out.
Does the estimate replace the limits on my swing?
No. The weight, age and developmental limits printed on your swing and in its manual always come first. The calculator gives a planning estimate only. It is not a guarantee and it is not medical advice.
Which weight limit should I choose?
Use the limit printed on the swing you own or are considering. Limits differ between models. If you have not chosen a swing yet, the calculator uses 25 lb (11.3 kg) as an example and tells you so in the result.
Can I use a baby swing for naps or overnight sleep?
No. A swing is not a safe sleep space. If your baby falls asleep in a swing, move them to a firm, flat sleep surface such as a crib or bassinet, and never leave a baby unattended in a swing.