A convertible car seat especially for children wearing a hip or arm cast made by Merritt Manufacturing of New Whiteland, Indiana.


This car seat has higher child weight and height limits than conventional models.  The wide seat, low sides, and included hammock for positioning provide proper fit for a child in an arm or spica cast. Includes a base for installing rear-facing for children up to 40 pounds and may be used forward facing starting at 25 pounds (though must follow state laws and Merritt Manufacturing strongly recommends rear-facing use if within the maximum height and weight limit).

Merritt Wallenberg

Last updated on April 1, 2024.

Child Requirements






Inches Centimeters Age (years)
Minimum 5 2.3 n/a n/a n/a
Maximum 80 36.3 60 152.4 n/a

Measurements and Characteristics

Car Seat Mass (Weight)

41 lbs./18.6 kg

Vehicle Fit Characteristics

  Outside height: 30 in./76 cm
  Widest outside width: 19 in./48 cm
  Vehicle requirements: There are no particular vehicle features necessary, other than a suitable seat belt for installation and adequate space for fit.

Child Fit Characteristics

  Narrowest torso area: not limited
  Narrowest seat cushion width: not limited
  Seat cushion depth: 12.5 in.
  Seat cushion depth extender options: No

Harness Fit Characteristics

  Harness Type: Five-point
  Number of harness height positions: 6
  CR bight to lowest shoulder height position: 5 in./13 cm
  CR bight to highest shoulder height position: 18 in./46 cm
  Crotch strap present: Yes
  Crotch strap adjustability: Yes (via hammock positioning)
  CR bight to nearest crotch strap position: 4.25 in./10.8 cm
  CR bight to farthest crotch strap position: 10.00 in./25.4 cm


  Semi-recline allowed in forward-facing position: No
  Other: N/A


  Tether present: Yes
  Special tethering: No

Accessories • Add-ons

Replacement foam, cover, and harness

Miscellaneous Information

  • MSRP (U.S. dollars): $2,710.00
  • Company certifies to meet standard:
  • FMVSS213 (U.S.): Yes
  • CMVSS 213 (Canadian): Not tested to this standard.
  • Will ship to Canada? Yes
  • Owner’s manual languages available: English

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