If a tree grows from the seeds left in the buried apple, this is an indication that your child will be very strongly linked to the element of Earth, and will never know hunger.
Eat the remaining half while envisioning your baby being born happy and healthy. You may wish to light a green, pine-scented candle while doing this. Green candles are great for healing spells, and pine is associated with Earth and fertility. If you are allergic or can't eat apples, throw it out, but take the time to do the visualization.