The Belgian striker has not scored since the 2-1 home defeat to Newcastle on September 14 although he has only played four matches since then due to a hip injury which kept him out for a month.
Lambert said: "People have to remember Christian is still a young guy, still learning, and he has only just come back from injury.
"He's had chances against Everton and West Ham, so you can't label anything against him.
"I'd be more worried if he wasn't getting chances, but the thing is he is getting them, so I've no worries about him whatsoever.
"Everyone has to help, just as everyone has to help defensively. It's a team game, we're in it together.
"It's true what they say - you win together, you lose together, and Christian is part of the whole thing, along with everybody else."
Villa have scored just nine goals in 10 Premier League matches this season as they prepare to host Cardiff on Saturday.
"The one thing you can never say about us is we don't give it a go because we try and create as much as we can," added Lambert.
"If we'd taken our chances against Everton, we would have won it. We had a penalty and two one-v-one opportunities.
"If Christian's header had been an inch under the bar against West Ham, or Andi (Weimann) had gone on for his one-v-one chance, we win the game.
"So again, I'd be more worried if we weren't creating. But I know the lads will come good. We're not far away."