If you said to me after your baby’s birth you wanted to formula feed this would 100% be supported. I know mother’s are capable of making informed decisions about giving formula milk! I did so myself for my own baby, mixed feeding both formula and breast milk. I fully support a mother’s choice as the best choice for her an her baby.
It is complicated by a NICU admission. An example being, a mother wanting to breastfeed, she has always wanted this, attended antenatal classes and educated herself on it, she states this to the nurses and doctors - her wish is to breastfeed. Then, due to a NICU admission, she is sleeping on the postnatal ward away from her baby. She worries about the baby being fed and asks the NICU nurse to give formula bottles overnight. The NICU nurse asks no questions and says “yes, of course”. This continues over a few days. The mother wasn’t informed that introducing formula early on can be detrimental to breastfeeding (if wanting to exclusively breastfeed). She wasn’t informed it can affect her breast milk supply. She wasn’t told she needs to pump milk if she is not feeding baby directly in order to maintain a milk supply. A week later the mother is upset when she isn’t producing enough milk for the baby, she is upset that no one told her giving the baby formula might mean her milk supply doesn’t increase as it should.
Often, it is not pressure to breastfeed. It is wanting mother’s to understand how supplementing with formula can affect breastfeeding. If they don’t want to breastfeed, that’s fine! But if they’ve told us they want to and we try to support that by giving information it’s not fair to then say we are pressuring.
If anything, from a nurse’s perspective a baby to a mother with GD is easier to look after practically if they are formula fed! We can see how much milk they’re getting, they often feed in a more regular pattern and it’s easier to schedule blood sugar checks. So my understanding of the OP’s situation is that she is possibly misinterpreting the nurse’s wanting to support her original wish to breastfeed rather than them pressuring her.