Bristol Palin's baby daughter, Sailor Grace, is growing up fast and the mother of two took to Instagram Tuesday night to reminisce about the day she brought her second child home from the hospital following her birth in December.
Palin shared a throwback photo of her 7-year-old son, Tripp, giving his baby sister a kiss on the nose while he cradles her in his arms.
"The day we brought Gracie home from the hospital, cannot believe she's four months already #icouldcry#myworld," the daughter of former Alaska Gov. Sarah Palin captioned the post.
Since welcoming her daughter just before Christmas, Palin, 25, has shared many photos of her children's bonding moments, including an adorable one earlier this month that showed Tripp and Sailor Grace smiling at each other and holding hands.
Palin captioned that photo simply with four heart emojis. So much sibling love!