First, give yourself plenty of time. Arrive early. Use the time to make sure everyone is fed and changed, if necessary. Keep the children in a double stroller, if they're comfortable in it, or find a quiet place where they can wander around without getting too far away from you.
Check with your airline about identification policies. It may be necessary for both adults to be present at the check-in counter and show their own ID. You may even be required to produce proper identification for your children. If both parents are not traveling together, you may be required to provide additional paperwork, especially if you are traveling internationally. Be sure to check with your airline before you travel to avoid any surprises.
When you go through security, be aware that you will most likely have to remove children from their stroller or carriers and send the equipment through the metal detectors separately. In general, the personnel will be very helpful in guiding you through, but it may be a bit tricky as you try to manage babies, equipment and bags, especially if you are required to attend additional security clearance. Be patient, remain calm, and explain your needs politely. The security policies are in place for your protection, after all.
Next: How can I keep them comfortable and happy during the flight?
