Added cross references where suitable to NICE guidance on breastfeeding. Updated guidance if necessary to be more specific on which healthcare professionals are responsible for undertaking reviews and checks. Updated scan and test times for women with chronic hypertension in pregnancy, and why scans and tests may be needed. Updated advice about creating care plans and who should be involved. Updated advice on anti-convulsants. Updated advice on angiotensin-receptor blockers during breastfeeding. Updated definitions and terms used to reflect current clinical practice. These recommendations are marked [2010, amended 2019]. Recommendations marked [2010] last had an evidence review in 2010. In some cases, minor changes have been made to the wording to bring the language and style up to date, without changing the meaning. Minor changes since publication October 2022: We added text to indicate that pulse oximetry may be less reliable in people with dark skin. We also added a link to the NHS patient safety alert on the risk of harm from inappropriate placement of pulse oximeter probes. See recommendation 1.5.7. August 2022: We corrected the term 'first pregnancy' to 'nulliparity' in recommendation 1.1.3. Accreditation