Size Guide

Theo and Ivy Size Guide

At Theo and Ivy, we understand that finding the perfect fit for your little one is essential. That's why we've created this size guide to help you choose the right size for your baby. Our baby clothing is designed with comfort and style in mind, ensuring that your little one looks and feels great.

Newborn (NB):

Weight: Up to 7 pounds (3.2 kg)
Height: Up to 17 inches (43 cm)


0-3 Months:

Weight: 7-12 pounds (3.2-5.4 kg)
Height: 17-23 inches (43-58 cm)


3-6 Months:

Weight: 12-17 pounds (5.4-7.7 kg)
Height: 23-27 inches (58-68 cm)


6-9 Months:

Weight: 17-21 pounds (7.7-9.5 kg)
Height: 27-29 inches (68-74 cm)


9-12 Months:

Weight: 21-25 pounds (9.5-11.3 kg)
Height: 29-31 inches (74-79 cm)


12-18 Months:

Weight: 25-28 pounds (11.3-12.7 kg)
Height: 31-33 inches (79-84 cm)


18-24 Months (2T):
Weight: 28-30 pounds (12.7-13.6 kg)
Height: 33-35 inches (84-89 cm)

    Please remember that each baby is unique, and our sizes are designed to provide a comfortable and stylish fit. If you have any questions or need further assistance, please don't hesitate to reach out to us at We're here to make your baby's clothing experience as enjoyable as possible.