Variations occur everywhere in nature. Being intersex is one of them and it is nothing to be afraid of. One of the most important things is to be open with your child (in an age-appropriate manner) and to listen to what your child tells you about their needs. There will be some challenges on the way, of course. One will be that most people still don’t know a lot about the existence of intersex people, so you might need to find ways to introduce the subject and educate people on the specific needs and situation of your child. For example, to support/advise school staff in preventing your child from being teased at nursery or school.
Parents who are open about their child being intersex report that, most often, the people they tell are interested to learn more and willing to support the child. As parents, you basically set the tone for how others will treat your child. For you (and your partner), it may take some time to get used to the idea and to learn what having an intersex child means. Give yourself this time. In the process, you might be asked to make some difficult decisions, such as being asked to consent to irreversible surgeries or other medical procedures, but remember that unless your child needs urgent medical attention for its intersex variation (which is rarely the case), you should get advice from more than one source and take time before choosing any definite course of action.