“We baptized Leonardo and Romeo today … ” Hilaria, 34, captioned a photo on her Instagram Story, featuring herself, Alec, 3-month-old Romeo, 23-month-old Leo, Rafael Thomas, 3, and Carmen Gabriela, 5 on Thursday.
She added to the image, which showed the entire family dressed in their best and sitting on pews inside the church, “I know … we were a little late with baptizing Leo … “
Want all the latest pregnancy and birth announcements, plus celebrity mom blogs? Click here to get those and more in the PEOPLE Parents newsletter.
In the series of photos that followed, Hilaria showed the stark difference in her two boys’ reactions — while Romeo “didn’t flinch,” Leo “flinched a lot.” Explained the mother of four, “He’s my sensitive baby.”
All was well with a little affection, though. “But he was okay with some kisses,” Hilaria wrote, sharing a snapshot of herself holding Leo and kissing his head.
RELATED VIDEO: Hilaria Baldwin Shares Intimate Video of the Moment She First Held Son Romeo
Carmen — who recently hit a big milestone of her own with her preschool graduation — is gunning for a baby sister, her mom said last month, admitting her daughter’s wishes might prompt her and Alec, 60, to have more children.
“She does have a sister — she has Ireland, and Ireland is so wonderful and they have a great relationship,” Hilaria said on the Today show of Alec’s 22-year-old model daughter from his previous relationship with Kim Basinger. “But there’s something about a little sister that she really wants.”