How to Track CMPA Symptoms: A Practical Baby Diary

When feeds, crying and diaper changes blur together, describing your baby's week can be difficult. A CMPA symptom diary gives you somewhere to put observations in time order. The NHS says a food and symptoms diary may be used during a food-allergy assessment.^[2] It does not prove that milk caused an event or diagnose an allergy: clinicians assess the history and decide what further evaluation is appropriate.^[1]

Use this guide for practical recordkeeping. For the medical process, read how CMPA is diagnosed; for the basics, start with what CMPA means.

Urgent symptoms come before the diary

If your baby has trouble breathing, sudden tongue or throat swelling, blue, grey or pale lips, or becomes limp or unresponsive, seek emergency help. These can be signs of anaphylaxis. Use prescribed epinephrine (adrenaline) immediately according to its instructions, then call emergency services: 911 in the US, 999 in the UK, or your local number. Call even if your baby seems better. Do not delay care to log an event or take a photo.^[2][3]

Choose one place for your notes

A notebook, phone note or app can work. Choose the option you can reach while caring for your baby, and use the same place each time. If several caregivers contribute, agree on a simple format: date, time, feed, observation and action. Add the caregiver's initials when that helps you follow up later.

Keep observations separate from questions. “Raised red patches on both cheeks at 14:20” describes what you saw. “Could this be related to the earlier feed?” belongs in a question column. A record can preserve both without presenting a suspicion as a conclusion.

Record the sequence, not just the difficult moment

NICE's allergy-focused history includes when symptoms started, their duration and severity, recurrence, feeding history and previous treatment.^[1] Use that as a starting point for the following record:

• Date and time: note the feed time and the time you first noticed the symptom separately. Write “about” if a time is approximate.
• Feed: record breastfeeding, formula, mixed feeding or solids already being offered. For formula or packaged food, use the exact product name. Include an amount if you know it; do not invent one.
• Observation: describe what happened, where you saw it and how long you observed it. “Vomited twice” is easier to interpret than “bad tummy.”
• Effect on the baby: describe what changed in feeding, sleep or usual activity, rather than relying only on “mild” or “severe.”
• Action: note any medicine already prescribed, advice received and what happened afterward. Record an existing care plan by its date.
• Uncertainty: leave gaps visible. “Onset unknown; noticed after waking” is a useful entry.

Food-allergy symptoms can appear soon after eating or later, so record actual times rather than assigning every event to the closest feed.^[2] There is no need to turn each note into a theory about a trigger.

A simple diary layout you can copy

This blank format works on paper or in a phone note. Add rows as needed; it is a record layout, not a symptom score or a diagnostic test.

Swipe across the table to see all columns.

For example, a fictional entry might read: “Monday, feed at 08:00; red patches noticed at 09:10; cheeks only; still visible at 09:40; no medicine given; ask how to describe the rash.” The entry records an order of events. It does not say the feed caused the patches.

Keep the diary manageable

Ask your clinician what to record and for how long. Bring the notes you already have to an appointment; a complete diary is not a prerequisite for asking for help. The NHS recommends seeing a GP if you think your child may have a food allergy.^[2]

Use the same words for recurring observations and include ordinary feeds or periods with no symptoms where practical. Mark missed entries rather than reconstructing an entire day from memory. If a photo is useful, keep its date with the corresponding note and ask the clinic how to share it.

Do not introduce a food, change formula or start an elimination diet to create a clearer diary pattern. Your care team should direct feeding changes; the NHS cautions against independently cutting out a major food such as milk and advises discussing formula choice with a GP.^[4] If breastfeeding questions arise, our breastfeeding and CMPA article provides further context for that discussion.

Turn the record into a short conversation

Before a visit, highlight your main concern, the earliest recorded event and two or three entries you want to discuss. Keep the full timeline available, including gaps and observations that do not fit your suspicion. Our CMPA appointment checklist helps organize the rest of your preparation.

If you prefer phone-based records, CMPA Baby supports feed and symptom records and a PDF report to share at consultations. Review your entries before sharing. The app organizes observations; it does not determine their cause or replace medical care. For descriptions of possible symptoms, see early signs of CMPA.