He can sit without support if I put him in that position. He can stand for a bit if I lean him on the sofa but that's it. Doesn't get on all fours, just kind of lies there. I have been putting him on his front all day everyday and putting things within reach for him to grab/crawl to. There's a bit of a slow one sided commando crawl type thing at best. Is there anything else I can do to encourage him to meet these milestones? Anyone else experienced this? Should I be concerned? I spoke to HV who thinks he's just taking his time figuring it all out.