YBF-42359-02920 · OpenVSafe

Timeline

Registration Vaccinations Survey responses Call reports Cases without a report Call attempts Call successful Pregnancy survey

2021-04-13
Registered in v-safe
2021-04-13
Dose 1 — Pfizer-BioNTech
2021-04-14
Health check-in — days 1–6 daily, dose 1
Feeling: Good · Site: Pain, Swelling · None

Adult check-in
2021-04-15
Survey response — days 1–6 daily, dose 1
MedDRA: Breast feeding — Feeling: Good · Site: Pain

Free text: Breastfeeding and I have had a decrease in milk supply since the vaccine.

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-04-16
Survey response — days 1–6 daily, dose 1
MedDRA: Breast feeding, Suppressed lactation — Feeling: Good · Site: Pain

Free text: Decreased milk supply breastfeeding

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-04-17
Health check-in — days 1–6 daily, dose 1
Feeling: Good · Site: Pain · None

Adult check-in
2021-05-11
Dose 2 — Pfizer-BioNTech
2021-05-13
Health check-in — days 1–6 daily, dose 2
Feeling: Poor · Site: Pain · Fever · Chills, Headache, Joint pains, Muscle or body aches, Fatigue or tiredness, Nausea, Vomiting · Be unable to work, Be unable to do your normal daily activities

Adult check-in
2021-05-14
Health check-in — days 1–6 daily, dose 2
Feeling: Poor · Site: Pain · Fever · Chills, Headache, Joint pains, Muscle or body aches, Fatigue or tiredness · Be unable to do your normal daily activities

Adult check-in
2021-05-15
Survey response — days 1–6 daily, dose 2
MedDRA: Lactation insufficiency — Feeling: Fair · Site: Pain · Fatigue or tiredness

Free text: Decrease in milk supply since the morning after I took the vaccine about 10-15 hours post vaccination and continuing today despite all my efforts to boost milk suppmy

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-05-16
Survey response — days 1–6 daily, dose 2
MedDRA: Lactation insufficiency — Feeling: Fair · Site: Pain · Fatigue or tiredness

Free text: Decrease in milk supply since vaccine

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available
2021-05-17
Survey response — days 1–6 daily, dose 2
MedDRA: Lactation insufficiency — Feeling: Good · Site: Pain · Fatigue or tiredness

Free text: Drop in milk supply from day of vaccine on and am working tirelessly to try to get it back up - pumping, staying hydrated, eating well and resting

MedDRA releases: 2021-09,2023-04,2024-11 · check-in free text available

Vaccinations

Dose	Date	Manufacturer	Co-administered
1	2021-04-13	Pfizer-BioNTech
2	2021-05-11	Pfizer-BioNTech

Free text

Release 7 — days 1–6 daily, dose 1

2021-04-15

Systemic reaction (other): Breastfeeding and I have had a decrease in milk supply since the vaccine.

2021-04-16

Systemic reaction (other): Decreased milk supply breastfeeding

Release 8 — days 1–6 daily, dose 2

2021-05-15

Systemic reaction (other): Decrease in milk supply since the morning after I took the vaccine about 10-15 hours post vaccination and continuing today despite all my efforts to boost milk suppmy

2021-05-16

Systemic reaction (other): Decrease in milk supply since vaccine

2021-05-17

Systemic reaction (other): Drop in milk supply from day of vaccine on and am working tirelessly to try to get it back up - pumping, staying hydrated, eating well and resting

Each entry is dated by the survey it was written in (the CDC re-sent the releases with survey dates in 2025); click a date to see that survey response. The CDC cut some text off at about 250 characters: symptoms in every release, and the other two fields in releases 9-12. Those entries are marked "cut off by CDC".

MedDRA terms by release

Field	Preferred term	2021-09	2023-04	2024-11
SRO	Breast feeding	✓	✓	✓
SRO	Lactation insufficiency	✓	✓	✓
SRO	Suppressed lactation	✓	✓	✓

✓ active code · ○ coded but marked inactive · blank = not in that release