I would put the 18 month old in a play pen or play space.Only give him soft infant toys to play with.I bought a nice walk through play yard on Amazon.It worked great and now we sometimes used it for the big kids to be able to build without the littles knocking everything down. Keep th18 month old occupied and if you are feeding the baby put him in the playspace.Try not to make it a punishment,just a fun place to play. Do not give up you can make it work.Good luck.

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