Table 1.

Data Analysis Structure.

Theme	Theme Definition	Category	Category Definition
Knowledge supports a woman’s capability to engage in BF behavior	How personalized knowledge of BF benefits, mental preparation, healthcare professional support, potential physical difficulties women may face, and the experience of others contributes towards extended BF	1. Personalize BF benefits 2. Antenatal mental preparation needed 3. Peer-shared tacit knowledge 4. Healthcare professional knowledge inconsistent 5. Knowledge of potential latch problems 6. Physical health important	1. Descriptions of how BF benefits are applied to personal circumstances 2. Descriptions of mental preparation supporting readiness to breastfeed 3. Descriptions of peer-sharing practical knowledge through a variety of routes 4. Descriptions of healthcare professional knowledge being variable and potentially conflicting 5. Descriptions of challenges with latching due to larger breast volume or tongue-tie 6. Descriptions of importance of overall physical health and staying healthy to engage in BF
Support provided by social, environmental and resources enable the performance of BF behaviors	How the opportunity to perform BF behaviors are influenced by social supports, the physical environment, and resources available	1. Social support importance 2. Reduced support of BF due to omnipresent formula feeding and loss of BF culture 3. BF support services and groups variable 4. Awareness raising needed 5. BF friendly environments 6. Lack of lactation support in maternity services 7. BF aids	1. Descriptions of social supports that supported or inhibited BF behaviors 2. Descriptions of formula feeding as the norm in Ireland and suppressing BF in cultures where BF is normal 3. Descriptions of different support groups and services impacting BF experience positively and negatively 4. Descriptions of different healthcare professionals needing greater education and awareness to support BF 5. Descriptions of environments such as workplaces, home and social settings that either supported or inhibited BF 6. Descriptions of lactation services being insufficient within maternity settings 7. Descriptions of BF aids such as pillows, co-sleeper cot, lanolin improving BF
Self-efficacy impacts motivation to perform BF behaviors	The importance of self-efficacy and determination in extended BF	1. Self-efficacy is important 2. Determination drives the habit	1. Descriptions of self-efficacy attributes supporting BF or body image negatively impacting self-efficacy 2. Descriptions of determination positively driving BF and cultural norms facilitating the determination

Note. BF = breastfeeding.