Worried Grandparent

If it was just crying and not sleeping I would agree with the GP, we had one of those in the family but the problems with feeding and his bowels, combined with the sleeping and crying problems is something that should be investigated.

See a different GP and ask for a referral to a paediatrician. If an NHS appointment is refused, ask for a private referral if you can afford it,or arrange to have an extended appointment with the practice nurse to discuss the problems.

My first baby slept through the night from day one. I thought how easy this is. DD was born 2 years later. WELL.... she grizzled and cried day and night. Whenever I woke up in the night to look at her, her eyes were open. I put her in a little pram next to the bed so I could lie down and rock her but it never really worked. We were up at least 5 times a night. During the day I pushed her in the pram to rock her to sleep. It didn't work. She was breastfed so I thought once she goes on the bottle she will sleep but no. Then I thought once she is weaned she will sleep more but no. This went on for well over a year. If I'd had her first she'd have been the only one I promise you! Don't recall any nappy problems though. Hope this helps a bit. PS. To this day she gets up at about 6am and is bright as a button.

Sounds similar to my DD.
Both my children have cows milk protein intolerance.

Can they try him with no milk?
If BF get mum to exclude dairy completely. It will take 6ish weeks to get out of her system but she may hopefully see an improvement quicker.

Formula would need to be special allergy formula.
It can be purchased but it’s expensive. She could push for a prescription. But many have a hard time having the allergy recognised.

DGS2 was like this but totally BF - still BF now 14 months. We rocked him, sang to him, walked round and round garden (he still loves the garden!) for hours. DD tried gripe water, infacol, chiropractor. Took him to Sick Children's hospital where consultant said he had infant dyschezia - basically colic as digestive tract has not matured as fast as rest of him. She was given ranitidine and gaviscon for the reflux - neither helped, raised crib mattress by putting pillow under - he ended up co-sleeping with mummy till he could crawl. DD insisted on being referred again as also had difficulty pooing and consultant prescribed movicol ½ sachet which he is still getting. We bought him a "My Hummy" white noise sleep aid - there are other makes but this one can be left on all night - it goes off after an hour and is re-activated by baby moving. He still sleeps with this at night and has been the best thing to help - also sends parents to sleep - haha. DD1 used Ewan the Sheep which is also good but switches off after 20 minutes. Tell your DIL to be insistent with the GP as it is very distressing. Also speak to health visitor and try to find a sleep clinic in their area as this also helped my daughter. If he is gaining weight it will probably pass eventually - 9 months for us but did get better slowly when he was able to be played with. Other things that can help are car rides or going in pram for long walk with grandparents but insist DS and DIL catch up on their sleep. My sympathies are with you x

What’s BF ?

Breastfeeding.

My Daughters little one suffered with reflux,
She had exactly the same symptoms, daughter and son in law where exhausted with this constantly crying baby who was obviously in pain. Doctor was slow on picking it up and more or less said it was just a crying baby. A friend had suggested checking for reflux as her little one had suffered with it.
Reflux medication helped a lot. Once weaning started it was discovered that grandchild had a cows milk intolerance, once realised my daughter cut out cows milk.
one of the other posts said that it is hard to get it recognised and it is.
Her second child also has it but she knew straight off what it was and the little one didn’t go through months of crying in pain like the older one did. I hope they find the cause soon.

My son too had similar problems and it turned out to be a slight malformation of the gut, something which caused him intense pain (on and off) right up to being 6 years old. My doctor too dismissed it as 'crying baby' but his cries were quite different when he was in pain.
Because we lacked help from the health system, I rubbed his tummy and back with warm oil and held him in a warm bath with Epsom Salts.
Any baby in pain may benefit from this comfort, whatever the cause.

Definitely push for a better diagnosis.
What's the after-care like in your country? Do you still have a midwife or nurse coming to check on Mum and baby? If so, enlist their support.

Check for allergies by eliminating dairy and other items from your own diet so baby doesn't get the proteins which some are allergic to. (see article).

slate.com/human-interest/2013/04/how-to-tell-if-your-baby-is-allergic-to-proteins-in-your-breast-milk.html

Ask the gp about reflux as happychops said. 2 of our dgs had it and were fine once weaned.

My GS used to scream and eventually it was discovered that he had a perforated eardrum. Luckily my daughter had health insurance through her job and quickly arranged for an operation to close the hole. She was able to stay overnight in the hospital with him.

It sounds like a reflux problem to me too.
www.nct.org.uk/baby-toddler/feeding/common-concerns/what-baby-reflux-symptoms-and-support

There are several charities which support reflux families - not sure where you are.
www.livingwithreflux.org/understanding-reflux/
is one of them.

How old is your grandson? My DS had 3-month-colic and cried most of the time. My DH and I took turns to jiggle him up and down and sing to him all evening. We didn't eat a meal together except on Saturdays when my mum had him for an hour or so. I was told it would stop when he was 3 months - and suddenly it did and he was fine!