Of course, it is. Breast milk should be given to a baby as much as possible even by using nursing bottle. It is essential for a baby, one month old, to have breast milk. Before, special sanitary care must be taken like washing your hands well with soap. Clean the breast to be milked with a clean wet towel or cleansing cotton. Milk the breast with a breast pump feeding set sterilized by boiling. Do not use a breast pump which does not form a set with a nursing bottle. The latter pump is a device to extract the remaining milk in order to empty the breast. If you have inverted nipples, why don’t you try to correct it? If it is too late for your first baby, you should still try it for your second baby. Apply a nipple puller to a nipple and push its rubber stimulating a baby sucking the nipple. Repeat this 4-5 times a day, allowing 5-10 min. for treating each breast. A nipple shield is sometimes effective for mothers with inverted nipples as well as those with flat nipples. Express milk gently and slowing. Apply a nipple puller to the nipple and push the rubber lightly and quickly. Repeat this two or three times at a time. It will be better to repeat this cycle three times a day.