Your 31-Month-Old: Longer Sentences, Rules Understood, Feelings Named
By the Growbaby team · Published Aug 4, 2026
Written against AAP, CDC and WHO guidance. How we write these guides
At a glance
- Sentences run longer, with several ideas held in one breath.
- The point of a game rule is grasped, and your breaches get reported.
- Objects get matched by colour and shape at the same time.
- Feelings get named out loud: sad, cross, scared, tired.
- Rules invented by your child may be applied firmly to you.
Rules stop being arbitrary somewhere around here. Instead of following an instruction because you gave it, your child starts grasping why a game has the rule it has, which is also the moment they begin pointing out when you break it.
Sentences run longer, colour and shape can be handled together rather than one at a time, and feelings get named rather than only shown.
What is new this month
Longer sentences mean more is being held in mind at once. To finish a sentence that started three ideas ago, your child has to keep the beginning available while assembling the end, and the false starts and repeated words you hear are that process running slightly behind. Waiting through the pause is more useful than finishing the sentence for them.
Understanding a rule, as opposed to obeying it, changes how games go. A child who sees the point of taking turns will enforce it, usually on you first, and that enforcement is a sign the rule is genuinely understood rather than merely memorised. Losing gracefully is a separate skill and takes considerably longer.
Matching by colour and shape together means two attributes are being held at once, so a red square has to be told apart from both a red circle and a blue square. That is a genuine increase in what can be juggled. Naming a feeling draws on something similar, since putting cross or sad into words means standing back from the feeling far enough to label it, and a child who can name feelings has a tool other than volume.
Week by week, in the app
Our paediatric specialist wrote one thing to notice and one thing to try for every week of the first three years. Here is what this month covers. The app works out which week your child is in from their birth date and brings each one to you on the day.
- Week 131Forming Longer Sentences
- Week 132Understanding Games with Rules
- Week 133Matching Colors and Shapes
- Week 134Expressing Emotions Clearly
This week, for your baby
Growbaby works out which week your baby is in from their birth date and brings that week's activity to you on the day, so you are not looking up where you are. Plus adaptive soothing for the nights and Growy for the questions in between.
This guide is for general informational purposes only. Growbaby is not a medical device and does not provide medical advice, diagnosis or treatment. Every baby develops at their own pace; for any question or concern about your baby's health or development, always consult your pediatrician or another qualified healthcare provider.