The Iron remain four points from safety after the disappointing defeat.
"We fell asleep at set-pieces and we've allowed them to get the first and second headers," said Baraclough.
“You can't afford that when you're fighting relegation. When you get given jobs to do, you should be able to see them out."
Sven-Goran Eriksson, the Leicester boss, was pleased with how his side reacted to their loss to Norwich City.
"Last Tuesday we lost (to Norwich) in a bad way. We have talked a lot about it since and today we were very concentrated and showed aggression, we have come back in a brilliant way," he said.
"With nine games to go, if we can show the spirit we showed here, we won't lose many games and we'll win a lot."
He also singled out Paul Gallagher, who set up all three goals, for praise.
"Gallagher's right foot is special, he is not far from Beckham in terms of his delivery of set-pieces," he added.