A lpt of ground has already been covered here. Here is a perspective from a gay father and someone who has been in a relationship for near 20 years. It is important to be honest and fair to yourself and your partner. Sex is only one aspect of a relationship but a significant one and one that is tied to our self esteem. Being bisexual may make both sexes attractive to you but not necessarily in equal parts. For myself an open relationship is not an option as there is too much room for hurt and misunderstanding as well as a great deal of responsibility for both your and your primary partners health. So can you at 21 imagine 10 or 20 years without resolving this. If not it may be time to explore and clarify your feelings. it seems that your wife has given you the opportunity to do this.
On another matter, you are a father and it sounds like you are bonded with your child. Six months is a huge deal of time and especially with an infant. I suggest that if yo wna ta real relationship with your child that you need to nourture it. Time flies by and kids grow up with or without you. You have an opportunity to maintain your relationship with your child while you sort out your sexuality and your wife need not carry the responsibility of rearing your kid alone. if it is important saty involved with your child. This is primary bonding time. Feeding, diapers, and middle of the night wake ups are part of the deal and give you time to bond as your child learns love and communication.
