All of my colonies made it through the winter and three of the 4 are thriving. The fourth is sluggish (slow to take in syrup and not many bees foraging compared to the other hives) and I plan a thorough inspection tomorrow. Assuming the queen is alive and laying what are my options for helping this colony out? I won't have fresh queens until May so requeening isn't an option until then. Would putting a few frames of brood from one of my other hives in help? If so, should they be frames of capped brood?

Thanks in advance for your advice.