When Will Baby Understand "No"? A mommy’s favorite phrase…”No!” Your baby will start to understand around 9-12 months Only use it when you truly need it Explain why you say no Arrange the house so there are less things your child cannot touch Tags:developmental milestonedisciplineParentingPediatricstelling your baby notoddlerwhen baby understands no Share: You may also like Kids are sucking down baby food pouches at record rates. October 23, 2024 by Dr. Tanya in Blog Every week, Caitlin Scuttio stops by Target and piles her cart with pureed food pouches for her 4-year-old and... Are you ready for AB 899? September 16, 2024 Skiing with Kids—10 lessons learned January 7, 2018 Pokémon Go (Away or Stay?) July 16, 2016