When Do Babies Say Mama and Dada

The sound and the meaning arrive months apart

This is the whole answer, and it settles most household arguments. Babies produce "mamama" and "dadada" as babble long before they use either to mean a person.

The HSE separates the two explicitly. At eight months, a baby may "say 'mama' or 'dada' — although they might not know what these mean yet". At twelve months, a baby may "use the words 'dada' and 'mama' in the right situations". Four months apart, in the same national guidance, for what sounds like the same word.

The CDC's revised checklist marks only the second version: "calls a parent 'mama' or 'dada' or another special name" sits at twelve months. That age comes from the 2022 revision published in Pediatrics, which set every milestone at the age by which "most (≥75%) children would be expected" to demonstrate it. So twelve months is roughly the point at which three in four babies are using it meaningfully — not the average, and not a deadline.

ASHA puts it in the ten to twelve month band: babies "say one or two words — like mama, dada, hi, and bye".

Why "dada" so often comes first

The AAP describes the mechanism without any sentiment attached: a baby "may even stumble on words such as 'mama' and 'bye-bye' quite accidentally, and when you get excited she'll realize she's said something meaningful. Before long she'll start using 'mama' to summon you or attract your attention. At this age, she may also say 'mama' throughout the day just to practice saying the word."

The order in which the sounds appear is about which consonants are easiest, not about who the baby loves. "B", "p", "m" and "d" are lip and tongue-tip sounds that babies land on early, which is why so many languages have parent words built from exactly those sounds. It also means a household where "dada" arrives first has learned something about consonants and nothing about preference.

What counts as meaning it

Consistency and context. The AAP's definition of a first word is generous and useful: "For your child, a 'word' is any sound that consistently refers to the same person, object, or event. So if she says 'mog' every time she wants milk, you should treat 'mog' with all the respect of a legitimate word." By that standard, a baby who says "dada" when a particular person walks in, and not otherwise, is using a word — and a baby who chants "mamamama" while chewing a toy is not, yet.

The AAP also notes the spread: "There's a tremendous variance in the age at which children begin to say recognizable words. Some have a vocabulary of two to three words by their first birthday. More likely, your baby's speech at twelve months will consist of a sort of gibberish that has the tones and variations of intelligible speech."

What helps

Responding as though it counted. The NHS advice for six to twelve months is to "name and point to things you can both see", to start looking at books without necessarily reading the words, and to play games like peek-a-boo that teach "taking turns, paying attention, and listening". The HSE's version is to get face to face, copy sounds and actions, repeat words, and "leave little pauses for them to take their turn".

The AAP adds consistency of labels: "if you call the family pet a cat today, don't call it a kitty tomorrow." And it advises talking through what is happening — "I'm drying you with the big blue towel" — because words attached to events are easier to learn than words in isolation.

Two things get in the way. Background noise: both the NHS and the HSE say to turn the television and radio off during play and talk. And dummies: the NHS says to "only offer a dummy when it's time for sleep", because "it's hard to learn to talk with a dummy in your mouth", and to aim to stop using dummies completely by twelve months.

If your baby was born early

Count from the due date. A baby born two months early is at ten months corrected on their first birthday, and the twelve-month checklist item does not apply to them yet. The AAP advises using adjusted age for tracking development until two years, noting that by then most children born preterm have caught up.

When to raise it

A first birthday with no meaningful words but plenty of babble, gesture and understanding is not an emergency, and the AAP explicitly describes gibberish with speech-like tone as the more likely twelve-month picture. What matters more than words at this age is the rest of the communication package: does your baby respond to their name, follow a point, hand things to you, and understand simple everyday words?

The HSE's twelve-month triggers are worth knowing, and they are about movement and skill loss rather than vocabulary: no independent mobility, not pulling to stand, or losing skills they had before. Its general advice applies too — contact a GP or public health nurse if you are concerned, or if your child shows signs of a hearing difficulty. Hearing is the first thing worth ruling out whenever speech is slow to arrive.

Understanding runs ahead of speaking

Before the first real word arrives, a baby already understands a surprising amount. The AAP puts it directly: "Before she can say many, if any, words, she'll probably be comprehending more than you suspect", and suggests a test — mention a favourite toy across the room and watch whether your baby looks towards it. If they do, "she's telling you she understands".

The HSE's list matches. At nine months a baby begins "to show that they understand some simple words, such as 'bye bye'". At ten months they "begin to understand what 'no' means". At twelve months they "understand more everyday words and respond to some simple instructions such as 'come here'", with the useful caveat that "this will be inconsistent for a while, especially when they are tired or distracted".

Gestures count as communication

ASHA lists pointing, waving and showing or giving objects in the ten to twelve month band, and the CDC's checklist places waving bye-bye at twelve months. A baby with no words but plenty of gestures — arms up to be lifted, handing you things, pointing at what they want — is communicating perfectly well and is usually in the middle of the ordinary range. A baby with neither words nor gestures at twelve months is the picture worth raising.