It's normal to feel pangs of anxiety when leaving your baby – even with your parents or a trusted caregiver. Feeling a bit nervous about separation from your little one is a sign that you're bonded.
That said, it's not a good idea to consistently give in to your worries. The need to keep your baby safe with you should be weighed against other realities, such as your mental health (taking breaks from your baby can be good for both of you), your need to bring in income through work, and your baby's need, over time, to learn to get along with others. Childcare can be both necessary and valuable.
If you're hiring a babysitter, ask for references from other parents you trust. Once you've found someone, ask her over and have her watch your baby while you do household chores. That way you can observe how she interacts with your child. Limit your first trips away from the house to quick shopping errands. When you leave the house, try not to let your apprehensiveness show. If you seem nervous, your baby may pick up on that, making separation harder for both of you.