Who it’s for: the baby whose awesome dad gets the “Grandpa?” double-take. What it says: clear as day—He’s Dad, not Grandpa. Why it hits: it’s funny, it’s true, and it makes every intro easier.
Matchy moment: pairs perfectly with the Old Daddin’ Hat
Suit up your little spokesperson—and let Dad wear the grin.
Size
Front body length
Body length
Body width
3-6M
13.38"
17.75"
9.38"
6-12M
14.75"
19.5"
9.88"
12-18M
15.88"
20.25"
10.38"
18-24M
17"
21.38"
10.88"
Details
Old Daddin’ “He’s Dad, Not Grandpa” Baby Onesie
Let the world know: he’s dad — not grandpa. This cheeky Old Daddin’ bodysuit is printed on the Bella + Canvas 100B for super-soft comfort and easy changes.
A soft, funny Old Daddin’ baby onesie that says “He’s Dad, Not Grandpa.” Cozy cotton, easy snaps, and durable print. Perfect new-dad gift from NB–24M.
Why you'll love it
Soft & snuggly: Airlume combed, ring-spun jersey that’s gentle on brand-new skin. BELLA+CANVAS
Easy changes: Envelope (lap-shoulder) neckline + three-snap leg closure. BELLA+CANVAS
Durable & comfy: Side-seamed with a tear-away label. BELLA+CANVAS
Garment details (Bella + Canvas 100B)
Fabric & weight (solids): 100% Airlume combed and ring-spun cotton, 32 singles, 4.2 oz. BELLA+CANVAS
Machine wash cold, inside out. Tumble dry low. Do not iron directly on the print. (Standard care for Bella + Canvas 100B and printed garments.) ShirtSpace
Shipping & Returns
For our policies, check out our policy pages. Click here for shipping, and refund policy for returns + exchanges.
Because every Old Daddin’ item is made to order, we do not offer free returns or free exchanges on non-defective items. If your item arrives damaged, defective, or incorrect, we’ll make it right at no cost to you. For size exchanges and standard returns, the item must be unworn and unwashed, and the customer is responsible for return shipping.
Premium quality, timeless style, and everyday comfort — from classic tees to signature caps and everyday accessories, each piece is crafted to make you feel confident, comfortable, and part of the Old Daddin’ legacy.
Frequently Asked QUestions
How does it fit?
Check the Size Guide located next to the size selector for measurements and sizing information.
How quickly will my order ship?
Our apparel is made to order and usually ships within approximately 3 business days.
What if I order the wrong size?
We offer returns/exchanges within 15 days of delivery. See our return policy for full details.
How should I wash it?
Machine wash cold, preferably inside out, and tumble dry low.
What is the origin of Old Daddin’?
Back in 2017, at an ultrasound, Robb (age 40) joked, “What does that make me?” after hearing his wife’s pregnancy called “geriatric.” The tech replied, “You’re an Old Dad.” The name stuck.
In 2024, after a tough stretch, Robb turned that joke into a brand with just a few hundred bucks and a vision. With patches sewn by the neighbor, embroidery by his brother-in-law, and a family-run garage operation, Old Daddin’ was born. Today, it’s more than apparel—it’s a community for dads who wear their status proudly.
I need help with my order. What should I do?
We’ve got your back! Email us at robb@olddaddin.com or use the contact form on our site. We’ll help with tracking, returns, or any questions you’ve got.
Where do your products ship from?
All hats, mugs, keychains, and magnets ship straight out of our garage in South Dakota—packed with care by the founder of Old Daddin’ and his wife. Most other products ship from U.S. facilities, with some specialty items fulfilled by trusted partners. This setup helps us get your order to you quickly while keeping quality top-notch.
