06 Aug When Will Baby Understand "No"? By Dr. Tanya In Activities and Playtime, Infants (4 to 12 months) 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: Dr. Tanya You may also like Skiing with Kids—10 lessons learned January 7, 2018 by Dr. Tanya in Activities and Playtime Layer up – Be prepared for extreme weather from very cold to sunny CA spring skiing. ... Pokémon Go (Away or Stay?) July 16, 2016 Even In Our Backyard May 5, 2016