In 60 seconds
What to know now
- At four months, development is observed across movement, communication, learning and social connection rather than one isolated trick.
- Safe sleep remains a firm, flat, separate space on the back even when sleep patterns change.
- Parent mental and physical health still belongs on the care agenda, including symptoms that first appear now.
What you may notice
Your recovery and mind
A new increase in anxiety, low mood, rage, intrusive thoughts or sleep difficulty needs assessment even months after birth.
Progressive strengthening should remain symptom-led; pain, pelvic pressure, leakage or bleeding is information to bring to a clinician.
What is happening
Baby care and development
Offer supervised floor and tummy time while awake, talk back to sounds and make space for safe reaching and movement.
If a skill is lost or you are concerned about hearing, vision, movement, feeding or interaction, raise it promptly rather than waiting for the next milestone list.
A short checklist
What to do now
- Move medicines, cords, hot drinks and small objects out of reach before rolling and grabbing become predictable.
- Review sleep spaces used by relatives or childcare, not only the main cot at home.
- Write down developmental observations and questions for the four-month visit.
Pause and check
What not to do—or what to ask first
- Do not use weighted sleep products, positioners or improvised padding to try to extend sleep.
- Ask about feeding readiness and individual growth rather than treating four months as a universal date to start solids.
What may be coming up
Appointments, tests and decisions
The four-month development and preventive-care visit should include caregiver concerns, growth, feeding, sleep and the next-stage safety plan.
For the support person
One useful thing a partner can do
- Check every care setting for safe sleep and emerging mobility risks, and keep protecting the parent's time for recovery and health care.
Contact your care team
Contact your doctor or maternity team promptly
Some concerns need advice before the next routine appointment even when they do not feel like an emergency. If a symptom becomes severe, sudden or frightening, use urgent care instead.
See when to contact careUrgent or emergency
Urgent signs during pregnancy or within a year after birth
Get medical care immediately for these symptoms. The list is not exhaustive; if something feels seriously wrong, seek help.
Open urgent warning signs