Ivanka Trump shared the sweetest message for her youngest baby in honor of his first birthday

Happy birthday little Theodore!

March 27 marks the first birthday of Ivanka Trump and Jared Kushner's youngest son, Theodore James. To mark the occasion, Trump shared a sweet moment from Theodore's first few hours on Earth.

"One year ago today, little Theodore was born, expanding both our family and our hearts! This little boy is pure sunshine! Happy birthday baby boy!" she wrote alongside the sweet snap.

Over the weekend, the mom of three took her children to the Smithsonian National Zoo and they made friends with one happy looking elephant.

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"Making some new friends in DC! ," the First Daughter wrote.

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Making some new friends in DC! 🐘

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By the look of it, little Theodore really loves elephants!

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Sunday Morning #mood

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Just like any kid, Theodore's first year has been full of well, firsts! Shortly after his grandpa, President Donald Trump was sworn into office, Theodore achieved his own milestone in the White House.

Trump shared her baby's first attempt at crawling with followers on Instagram in January.

RELATED: Photos of Ivanka Trump's family life:

Intimate photos of Ivanka Trump's family life
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Intimate photos of Ivanka Trump's family life
You are my light, my love, my life. Happy 9th anniversary, Jared.
A little over a year ago on Easter Sunday, this little chick was born and our family was complete! Happy Easter! 🐣🐰
Happy Mother's Day to my incredible mom, Ivana. And to my children, thank you for giving me the gift of motherhood. You are my inspiration! #mothersday
Straight from the plane to a date with the kids in the Dumbarton Oaks Gardens. It was an amazing trip, but it's great to be home!
Theodore caught contemplating if he'll be able to eat his body weight in birthday cake. (Postscript: he came insanely close 🎂🍼🎈🎂 #babymath #1stbirthday #cousindate
Learning to code with Arabella tonight! By supporting computer science curriculum in our schools, I hope that all children will have the opportunity to become fluent in this language of the future. #WomenInSTEM
It's hard to be away... especially when this little dude is waiting for you at home! It's good to be back!
Exploring the wonders of the @smithsonian National Museum of Natural History 🦋
New Year's Eve + Last Night of Chanukah
Epic first Monster Truck show with the kids! #MonsterJam @monsterjamlive
Marine One 🇺🇸
Sunday in Palm Beach!
After-school fun making hamentashen for Purim with Arabella and Joseph
Joseph's favorite exhibit at @amhistorymuseum was Ralph Baer's workshop, inventor of the first video game! #STEM #Smithsonian #latergram
Sunday Morning #mood
Watching Marine One land on the South Lawn
Taking a call in the White House with my personal assistant Theodore. ❤
Such a surreal moment descending the steps of Air Force One for the first time with my family.
Goodnight! 🐻
Blair House, DC #latergram
With my family at the inaugural interfaith prayer service at National Cathedral.
Heading to the parade! 🇺🇸 #inauguration
Arriving in Washington DC with my family. A very special moment! #MAGA #Inauguration2017
My little packing buddy!
Baby it's cold outside!
2016 has been one of the most eventful and exciting years of my life. As you close out yours, I wish you peace, joy, love and laughter. Happy New Year! #NYE
Beach Buddy

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