Size Chart

Baby onesie size guide:

  WIDTH (inches) FITS BABY LENGTH (inches) FITS BABY WEIGHT (LBS) (lbs)
3-6m  9 3/8 20-25 12-16
6-12m 9 7/8 25-28 16-22
12-18m 10 3/8 28-30 22-27


I Need My Monster ABC Toddler Short Sleeve T-shirt:

SIZE LABEL LENGTH WIDTH
2T 15 ½" / 39.4cm 12" / 30.5cm
3T 16 ½" / 42cm 13" / 33cm
4T 17 ½" / 44.5cm 14" / 35.6cm
5T 18 ½" / 47cm 15" / 38cm

*Product measurements may vary by up to 2" (5 cm).


Mack from I Need My Monster Kids T-shirt:
SIZE LABEL Length  width
XS 20 ½" / 52cm 16" / 40.6cm
S 22" / 56cm 17" / 43.2cm
M 23 ½" / 59.7cm 18" / 45.7cm
L 25" / 63.5cm 19" / 48.3cm
XL 26 ½" / 67.3 20" / 50.8cm

*Product measurements may vary by up to 2" (5 cm).