WASHINGTON (CNN) -- Three days after banning fliers from carrying liquids, gels and lotions past security checkpoints and onto airplanes, the Transportation Security Administration announced Sunday several "tweaks" that would allow passengers to board with small doses of liquid medications.

In addition, the agency said it will now demand that all passengers remove their shoes so they may be X-rayed.

Under the new rules, travelers can take up to four ounces of non-prescription medicine, glucose gel for diabetics, solid lipstick and baby food, the agency said.

All aerosols are prohibited.

"The refinements we are announcing are based on feedback from our security officers, the public and our partners," said TSA Assistant Secretary Kip Hawley in a written statement. "We are maintaining the same level of security while clarifying interpretations in the field. These tweaks are aimed at making a smoother process at the checkpoint."

TSA first ordered the ban on liquids, gels and lotions after the overseas arrests of people allegedly involved in a plot to blow up planes flying from the United Kingdom to the United States.

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