If you notice a decrease in your or your partner's fertility over time, then it is time that you understand about the factors that could be behind the decrease. It can look like an overwhelming task to do so, but if you focus well then it'll be a smooth ride. You should first understand the general issues that couples face when they are trying to conceive. After you do so, you should look at your daily life and your habits more closely and understand what factors could be affecting your fertility. Once you understand the reasons behind the decrease of your fertility, you can work towards ways to improve it.