Because the vagina stretches during sex, vaginal noises after sex can become worse after you have had a baby as more air is able to collect. There is little that can be done to remedy this, but making sure your pelvic floor muscles are toned up could help. You can tighten them by pretending that you are trying to stop passing urine - pull up slowly to a count of 5, hold for a further 5 counts, then gently relax again. Repeat this at least 20 times a day, and you should feel a benefit after a few weeks. It is important to continue with these exercises throughout your life to keep them firm.
Hiccups are very common and normal.
They occur when the muscles used for breathing in suddenly contract powerfully - why this should happen, no one really knows. They tend to be more common when the stomach is very full or after drinking alcohol. Very rarely, some people find they cannot get rid of hiccups. There are a few medicines which can be helpful in these situations, and your doctor can advise you about this. Persistent hiccups are often associated with certain health problems such as heart attacks or some cancers.