Baby cradle swing for over 25 pounds?

My son is 5 month old and he is over 20 pounds. He is to long for most swings. He cannot sit up unsupported yet and cannot crawl. We are looking to find a swing he won't grow out of in a month.
We like the Fisher Price cradle and swing but it goes up to 25 pounds. He only like to swing from side to side not front to back.
 
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