My 20-day-old baby is having difficulty latching directly to my breast due to my flat nipples. I have been using a nipple shield for the past 15 days, but she still struggles to latch and it causes me unbearable pain. I have also tried using a manual pump, but my nipple is not popping out. This situation is making it very difficult for me to manage and feed her properly, resulting in weight loss instead of weight gain. What can I do to address this issue and ensure my baby gets the nourishment she needs?