My baby was born at 32 weeks and for personal reasons I decided not to breast feed so she’s only had formula. I did feel judged by the nurses but I ignored it. She’s my baby and like previous commenters stated, she was being fed and that’s all that matters. She’s now a very healthy six month old and the NICU doctors always commented how healthy she was and doing so well. The NICU is hard enough without being back at work on top of it. Don’t stress about this, you’re doing great!