Rach - DS is a bit the same after his cluster feeds in the afternoon/before 6-7pm. I just hold him tight to me, pat his bum and walk around - I've put it down to "over tired" and not wanting to "let go"......
DS was born 3.3kg 51cm length, lost a lot of weight took 2 wks to return to normal, and at 7wks weighed 5.3kg 57cm length....