Here's the deal. You're standing in the store holding two bats and a bucket of balls, and the labels all say different things. Before you spend a dollar, give me five minutes. We'll sort out the ball by age, then let her swing settle the bat.
In most fastpitch leagues, girls 10U and younger play with an 11-inch ball and 12U moves to a 12-inch ball; 6U varies by league. Pick a bat she can hold out at arm's length for about 10 seconds, and make sure it carries the stamp her league requires.
Train it: Level 2 Complete Contact Builder → Free: Free Softball Practice Plans →What size softball does my daughter use at her age?
Softballs are measured around the middle, like a waistband. A baseball is 9 inches. Youth fastpitch uses an 11-inch or a 12-inch ball, and the switch usually comes at 12U.
| Age group | USA Softball | USSSA Fastpitch | Little League Softball |
|---|---|---|---|
| 6U | Check your league | 11-inch (10 and younger) | Check your league (Tee Ball) |
| 8U | 11-inch | 11-inch | 11-inch (Minor League) |
| 10U | 11-inch | 11-inch | 11-inch (Minor League) |
| 12U | 12-inch | 12-inch | 12-inch (Majors) |
Two heads-ups. In Little League tournament play, the 9- to 11-year-old division uses the 12-inch ball, so a 10-year-old all-star may see the bigger ball early. And many 6U programs use a softer training ball. That's a league choice, so check your league's rules.
You'll also see 10-inch balls for sale. USA Softball's rulebook lists a 10-inch ball, but its girls' fastpitch divisions play 11 and 12.
How do I pick a softball bat length and weight?
Most store charts match bat length to her height and weight. Use one for a starting range, then forget it. The chart has never seen her swing. You have.
I like hitters who make the bat look light. If the bat is swinging her, it's the wrong bat, no matter what the chart says. Do these three tests in the living room.
- Arm's-length hold: she grips the handle with her top hand and holds the bat straight out to her side. Count to 10. If the barrel dips or her arm shakes before 10, go lighter.
- Palm check: stand the bat knob-up against the outside of her leg, arm hanging loose. The knob should reach about the middle of her palm. Well above her wrist means it's long.
- Ten-swing test: outside, with room all around, she takes 10 full dry swings. Watch swing 10. If it looks as quick and level as swing 1, she owns the bat. If she leans back to lift it by swing 6, the bat owns her.
Between two sizes? Take the lighter one. "Less is more." For a 9-year-old, that means a bat she can whip through the zone beats a bigger bat she's late with.
Which stamp does a youth fastpitch bat need?
This is where good money gets wasted. A great bat with the wrong stamp sits in the dugout. Fastpitch bats are 2 1/4 inches across at the barrel, thinner than youth baseball bats, and each organization looks for its own mark.
- USA Softball: the bat needs a USA Softball certification mark and can't be on its non-approved list. Heads up: bats with the 2013 mark are not approved for girls' fastpitch, so look at the mark itself.
- USSSA Fastpitch: look for the USSSA thumbprint mark (the 2020 Fastpitch Only mark or the earlier 2014 mark) on the taper, rated 1.20 BPF.
- Little League Softball: a softball bat no longer than 33 inches and no wider than 2 1/4 inches, and non-wood bats must be printed with a 1.20 BPF.
Rec in spring and travel in summer? Read both rulebooks. "Do your homework." For a parent, that means five minutes with the rulebook before checkout, not a return trip after the first game.
Our youth softball bat size guide explains bat "drop" and when to size up.
What should we do with the new bat and ball?
Get her swings with the same size ball she'll see on game day. Five minutes a day beats one long Saturday.
- Tee swings: 15 swings at a game-size ball. Every line drive is a point.
- Soft toss: 10 tosses from a parent kneeling off to her side, about 6 feet away, tossing from below like a windmill release.
- Finish check: after each swing she holds her finish for a 2-count. Balanced finish, quick bat.
Indoors, use foam or soft training balls and clear plenty of space. Helmet with a face guard any time someone is pitching or tossing to her. If her wrist, elbow or shoulder hurts, stop for the day.
Want 16 guided sessions that build her swing step by step? The Complete Contact Builder is in the $25/month membership for baseball and fastpitch hitters ages 7–12, and Lesson 1 is free. For the team side, grab our free softball practice plans.
One thing to remember
Match the ball to her division, and pick the bat she can swing quickly on her tenth swing.
What to do this week
Look up her league's ball size and bat stamp tonight. Then do the arm's-length hold and the ten-swing test with her current bat, and write down what you see.
Parent questions
When does my daughter move up to a 12-inch softball?
In USA Softball and USSSA, girls move to the 12-inch ball at 12U. In Little League Softball, it's the Majors division, and the 9- to 11-year-old tournament division also uses 12-inch balls.
Can she practice with a 12-inch ball if her league uses an 11-inch?
She can, but most of her reps should be with the ball she'll see in games. Mix in a few 12-inch swings the season before she moves up.
Can one softball bat work for both rec and travel?
Only if it carries the mark each league requires. Check both rulebooks before you buy, since USA Softball, USSSA and Little League each list their own standard.
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Sources: USA Softball: 2025 Official Rules of Softball (Rule 3, bat and ball specifications) · USA Softball: Certified Equipment (bat certification marks) · USSSA Fastpitch Official Playing Rules, 18th Edition (ball size and bat marks) · Little League: Does my bat meet the softball bat standards? · Little League: 2026 Softball Tournament Playing Rules (ball size by division) · Little League: NFHS and Little League Softball rules comparison (12-inch ball, Majors and up)