This is an HTML version of an attachment to the Official Information request 'Pfizer vaccine effects on Lactation'.

133 Molesworth 
PO Box 5013 
Wellington 6140 
New Zealand 
25 August 2021
T+64 4 496 2000 
Paul Jones 
By email: 
[FYI request #16233 email] 
Tēnā koe Paul, 
Response to your request for official information 
Thank you for your request under the Official Information Act 1982 (the Act) to the Ministry of 
Health (the Ministry) on 29 July 2021 for the documentation and evidence supporting the 
official statements regarding the Pfizer vaccine (Comirnaty). I wil  respond to each part of 
your request in turn: 
“With reference to the following link;
Under section Breastfeeding it states; 
"If you’re breastfeeding (as with all vaccines on the New Zealand Immunisation 
Schedule), there are no safety concerns about getting the Pfizer vaccine (Comirnaty)." 
The statement above is a summary of the advice from numerous professional organisations 
including: The Royal Australian & New Zealand College of Obstetricians & Gynaecologists; 
Public Health England; American College of Obstetricians and Gynaecologists, and the 
Society of Obstetricians and Gynaecologists Canada. The advice was published by the 
Immunisation Advisory Centre in consultation with the Ministry of Health.   
Breastfeeding is not a contraindication to vaccination to any vaccines on the New Zealand 
Immunisation Schedule which can be viewed at the following link: en%20Resources/AdministrationBreas
The relevant statement is provided below: 
“A woman who is breastfeeding can be immunised safely with both inactive vaccines such 
as tetanus, hepatitis B, and human papil omavirus vaccines, and live vaccines such as 
measles/mumps/rubella (MMR) and varicella (chickenpox) vaccines.” 
The Pfizer vaccine is not excreted in the breast milk: article/2781679 
Therefore, there is no evidence that the baby wil  receive any vaccine by being breastfed. 

Further information regarding breastfeeding after vaccination against COVID-19 can be 
found in a recent Nature article here: 
“Pfizers document released in the following link;

On page 32, section "11.2 Lactation" states;  

"Risk Summary"  
"Data are not available to assess the effects of Pfizer-BioNTech COVID-19 Vaccine on 
the breastfed infant or on milk production/excretion."  
This means Pfizer own documentation is contrary to the Ministry of Health's 

statements and understanding of the above as if no data is available then you can't 
make any claims.”” 
The reason why the statement from the manufacture says that data is available to assess 
the effects of the Pfizer vaccine on the breastfed infant or milk production is because they 
are referring to the lack of randomised trials comparing breastfeeding women who received 
the vaccine to breastfeeding women who did not receive the vaccine. This is because 
pregnant and breastfeeding women were excluded from the initial randomised controlled 
trials. However, this does not mean that there is no evidence supporting the use of 
vaccination in breastfeeding women. The recommendation to use Pfizer in breastfeeding 
women in New Zealand is based on a wide range of sources including the following: 
recommendations from professional bodies as above, the known pharmacology of the type 
of vaccine, in particular the fact that the vaccine is not a live virus, rather is a segment of 
modified RNA, the safety of other similar vaccines administered to pregnant women and 
monitoring of the large number of women who have received vaccines while breastfeeding. 
For your reference, the Ministry’s COVID-19 vaccine advice for women who are pregnant, 
breastfeeding and trying for a baby as at 16 June 2021, is publicly available at:
Under section 28(3) of the Act you have the right to ask the Ombudsman to review any 
decisions made under this request. The Ombudsman may be contacted by email at: 
[email address] or by calling 0800 802 602. 
Nākū noa, nā 
Gill Hall 
Group Manager 
COVID-19 Science and Insights 
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