Search strategy for the PubMed
| No | Search terms |
| #1 | Vaccin* |
| #2 | Hesita* OR Refus* OR reluctan* OR Attitude* OR Accept* OR Behaviour OR Non-vaccin* OR Uptake |
| #3 | #1 and #2 |
| #4 | Immuni* |
| #5 | #3 OR #4 |
| #6 | Novel Coronavirus OR SARS-CoV-2 OR COVID-19 OR COVID-19 disease |
| #7 | COVID-19 Vaccines [MeSH Terms] |
| #8 | #6 OR #7 |
| #9 | Female [MeSH Terms] OR Women [MeSH Terms] |
| #10 | Perinatology [MeSH Terms] OR Peripartum Period [MeSH Terms] OR Postpartum Period [MeSH Terms] OR Perinat* OR Lactat* OR Suck* |
| #11 | Pregnancy [MeSH Terms] OR Pregnant Women [MeSH Terms] OR Pregnan* |
| #12 | Preconception* OR Prepregnan* |
| #13 | #9 OR #10 OR #11 |
| #14 | Observational study |
| #15 | Cohort study |
| #16 | Cross-sectional study |
| #17 | Case–control study |
| #18 | #14 OR #15 OR #16 OR #17 |
| #19 | #5 and #8 and #13 and #18 |