Spice I don't have any experience to offer you, but at this stage DP are planning on an only child. We are both one of two and extremely close to our siblings, but our feeling is that with our lifestyle and age planning for more wouldn't be in the child's best interests.

Like a PP said, you have plenty of time to make these decisions. Enjoying your precious little Charli now doesn't mean you can't add to the family later. We were just looking at old pictures of our nieces recently and commenting on what a baby the elder was when the little one was born. At the time we thought Miss 2 was so grown up (and indeed, she had changed and matured incredibly quickly) but when we look at those photos she is only a baby herself. There are 3 1/2 and 4 1/2 years between myself and sister and DP and sister and being that extra distance apart didn't mean that we weren't close. Goodluck with what you decide, and in the meantime enjoy your darling little girl