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STRETCH IT OUT
Isaiah clocks in some mother-son time at the gym, where the toddler can be seen working on his yoga moves with mom Carrie.
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Isaiah may not have made it to New Zealand with his famous mom, but he sure did try — as evidenced by this cute snap.
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Bring on the belly rubs! "I half expected these two to clash, but with lots of carefully watched playtime and working hard to teach both how to treat each other, we've managed to do alright!" Underwood wrote of her son and dog Penny's relationship. "I even think they might [heart] each other!"
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Isaiah runs around the park while the Grammy winner documents the sweet moment.
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CUDDLE & CURL
The famous mom has definitely mastered multitasking. "He doesn't care that Mommy had to get ready for a show...all he knows is that he woke up cranky from his nap and needed a cuddle...and I was more than happy to comply," she captioned a dressing room photo.
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WHOLE NEW WORLD
Isaiah got to "take in" New York City in October.
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"Some mornings, pants are optional...even when the fedora is not. Just kidding, we had a blowout. #KeepingItReal #momlife," the singer captioned a photo from her morning struggles.
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Underwood had flawless plans for her first Mother's Day. "Plans for today: snuggle with this handsome guy. That is all. Pretty sure it's going to be a great day!" she said on Instagram.
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The Sesame Street fan gave Elmo a sweet hug during a visit to Sesame Place.
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"He soaks in the sunshine … and I realize that he is mine … I don't deserve such sweetness," Underwood, 34, captioned a photo of Isaiah laughing, which she posted to her Instagram.
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At seven months old, Isaiah played with his toys while wearing a pumpkin-esque mask.
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Seen here flipping through a picture book, Underwood and Fisher's little one sported a gingham print shirt to tackle on reading time.
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Although this photo finds Underwood and her son on a rare getaway, it doesn't compare to the dream vacation the singer has in mind for her son. "I want to take him to Disney World when he's 5," she says.
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A CANDID MOMENT
"[Mike] is a great dad," the country star told PEOPLE. "My trust in him has only gotten deeper."
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LIKE MOTHER, LIKE SON
Isaiah took a turn at a baby piano, proving that his Grammy-winning mom's penchant for music definitely runs in the family.
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STEP BY STEP
"I don't think Mike would be like, 'We failed!' if he doesn't play hockey," Underwood told PEOPLE of her son, pictured here wearing his dad's hockey jersey.
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Isaiah squeezed in a much-needed nap session by a window.
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MOMMY & ME
"Right now he's such a blank canvas," the singer told PEOPLE of Isaiah.
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"We want him to have a good, hardworking heart," Underwood said of her and Fisher's wishes for their son, pictured here taking a nap with dad.
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EVERY LAST DROP
"Enjoy it, baby boy...when you're an adult, sticking your face in the bowl to lick the bottom is 'frowned upon,' " Underwood jokingly warned her son, who is clearly passionate about food.
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LIKE FATHER, LIKE SON
Isaiah inherited Fisher's perfect selfie technique.
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In January, Isaiah came face-to-face with a very special "new friend."
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Isaiah and his dad got a bit sleepy during the little one's first trip to Mom's band rehearsal.
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