Free tool
Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece and leave with the element ID LEGO asks for, or a link to buy the part.
Checking
36 pieces in 26 part and color combinations, plus 1 minifigure.
LEGO counts 36 pieces. This inventory comes from a separate parts catalog and lists 40, including the 4 parts inside the minifigures; the two do not always count the same elements, so their totals differ. Spare parts are counted in neither figure.
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
LEGO's request form asks for the set number (41403) and each piece's element ID, both listed above.
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Brick 1 x 2
×7
Plate 1 x 2
×2
Tile Special Round 1 x 1 with Hollow Bar
1 spare in the box
×1
Brick Sloped 30° 1 x 2 x 2/3
×1
Equipment Baby Bottle with Handle
×1
Plate 1 x 2
×1
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper)
×1
Plate Special 2 x 2 with Groove and Center Stud (Jumper)
×1
Panel 1 x 2 x 1 with Rounded Corners and 2 Sides
×1
Plate Round 1 x 1 with Open Stud
1 spare in the box
×1
Plate Special 1 x 1 with Clip Vertical [Thick Open O Clip]
×2
Tile Special Round 1 x 1 with Hollow Bar
1 spare in the box
×1
Equipment Hose Nozzle / Gun with Side String Hole Simplified
1 spare in the box
×1
Plate Special Round 1 x 1 with Hollow Stud and Horizontal Bar 1L
1 spare in the box
×1
Tile Special 1 x 2 with Handle
×1
Bracket 2 x 6 - 1 x 6 Inverted
×2
Plate Round 1 x 1 with Solid Stud
1 spare in the box
×2
Animal, Rabbit / Bunny, Baby Sitting with Black Eyes and Lavender Nose Print
×1
Sticker Sheet for Set 41403-1
×1
Equipment Medical Syringe
1 spare in the box
×1
Road Sign Clip-on 2 x 2 Square [Thick Open O Clip]
×1
Equipment Cutlery - Spoon, Rounded Bottom
1 spare in the box
×1
Pod, Square 3 x 8 x 6 2/3 [Male]
×1
Pod, Square 3 x 8 x 6 2/3 [Female]
×1
Cone 1 x 1 [Top Groove]
×1
Dish 2 x 2 Inverted [Radar]
×1
Mia - White Jacket, Dark Purple Skirt, Veterinarian
×1
Tick each piece as you find it, or mark it missing.
LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for the set number and each piece's element ID, the number printed beside the piece in the parts list at the back of the instructions. This checker lists both.
Request a replacement from LEGOMark a piece missing and your list links it to an eBay search for that part, which also covers pieces from older or second-hand sets.
Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.
