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Mockingbird 2nd Seat Kit 3.0

The Mockingbird 2nd Seat Kit 3.0 is rated for a child up to 45 lb, per Mockingbird. Second seat that converts the Single-to-Double Stroller into a double, with reversible seats and a reversible seasonal liner.

  • $175List price
  • 45 lbChild up to
See it on Mockingbird's site

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All ride-on boards and second seats

How the 2nd Seat Kit 3.0 stacks up

Against the 21 ride-on boards and second seats we track. The shaded band is where the middle half of them fall; the dot is this one.

Child weight limit45 lb11th highest weight limit of 21

Within the typical range for ride-on boards and second seats (44 lb to 50 lb).

This one
35 lbmiddle 45 lb55 lb
Price$1758th lowest price of 11

Within the typical range for ride-on boards and second seats ($129.99 to $189.95).

This one
$49.99middle $149.99$349.95

What sets the 2nd Seat Kit 3.0 apart

Measured against the 21 ride-on boards and second seats we compare, from each maker's published specs.

  • Child weight limit: 45 lbin the middle half of the 21 ride-on boards and second seats that publish it (44 lb to 50 lb)

Next to its closest matches

What the 2nd Seat Kit 3.0 fits

Mockingbird's fit list names 1 stroller on Cribpicks:

Listed fit: Mockingbird Single-to-Double Stroller. Not compatible with the Single Stroller or Travel Stroller. Matched by brand and model name. Fit can depend on the model year.

Listed features

  • Reversible seasonal liner is machine washable
  • Tool-free install
  • Built-in leg shade

Worth checking

  • Only for the Single-to-Double Stroller
  • Infant accessory sold separately for young babies

Where to buy the 2nd Seat Kit 3.0

Prices and availability change. We may earn a commission from some links.

good to know
  • Check for recalls: Search the agency's recall list with the model number and date code from the label: CPSC recall search.
  • Fit: check the maker's fit list for your exact stroller and seat. Check the label and the maker's instructions, and ask your pediatrician about your child.

Full specs

Mockingbird 2nd Seat Kit 3.0
TypeRide-on board or second seat
List price$175
Fits these strollersMockingbird Single-to-Double Stroller. Not compatible with the Single Stroller or Travel Stroller.
Child weightUp to 45 lb
Machine washableYes
Maker's use notes45 lb limit per seat in double mode. an infant accessory (Bassinet, Infant Seat Insert or Car Seat Adapter, sold separately) for young infants until head and neck control.

Compare the 2nd Seat Kit 3.0 with

How each closest rival differs from the 2nd Seat Kit 3.0, from the makers' specs.

Ask the meadow

2nd Seat Kit 3.0: questions answered

From Mockingbird's published specs, last checked 2026-11-09.

Which strollers does the Mockingbird 2nd Seat Kit 3.0 fit?

Per the maker: Mockingbird Single-to-Double Stroller. Not compatible with the Single Stroller or Travel Stroller. Fit depends on the exact stroller model and year. Check your stroller's model number against the maker's list before you buy.

What are the limits for the Mockingbird 2nd Seat Kit 3.0?

The maker lists up to 45 lb. Check the label and the maker's instructions, and ask your pediatrician about your child.

Any use restrictions on the Mockingbird 2nd Seat Kit 3.0?

The maker says: 45 lb limit per seat in double mode. an infant accessory (Bassinet, Infant Seat Insert or Car Seat Adapter, sold separately) for young infants until head and neck control.

What's the difference between the Mockingbird 2nd Seat Kit 3.0 and the Silver Cross Wave Ride-On Board?

By the maker specs, the Wave Ride-On Board lists for $5.01 less, the 2nd Seat Kit 3.0 has the higher weight limit. Check that each fits your stroller. See them side by side.

Still wondering? Write to us at hello@cribpicks.com and we'll look it up.

More ride-on boards and second seats

Where these specs come from

Last checked 2026-11-09. Spot something wrong? Tell us. Read our editorial and safety policy and corrections.