22 week old woke up last night at 1am crying. Didn't need nappy changed and when offered milk, only drank 2 oz. Had been sleeping through since 12 weeks, so unusual, but I thought was once off. All day today, has been bit whingy and unsettled at naps. Has had 7 pooey nappies today, at least 6 of them like diarrhoea but yellow in colour. He is now up, downstairs with us as he was crying again and has just done another diarrhoea nappy - this time, green in colour and still watery/with bits in (sorry for TMI). Seems ok in himself otherwise, just bit whingey. We had been weaning him - for the last three days, he's had one cube of pureed apple at lunchtime (has so far had pear, apple, rice) which he loves and showed no problems after.
Basically, what do I do? Keep offering milk, obviously, but shoudl I contact GP? Could this be a virus? Any ideas?