Kate told how she broke down and wept when she got home after visiting a baby bank helping vulnerable families at the start of the Covid-19 lockdown.
The duchess recalled: "It can get very emotional. In remember a couple of the families I met from King’s Lynn and I went home and literally burst into tears, their stories were so moving.
“The struggles they have gone through, the bravery they have shown...in extraordinary circumstances. Helping their families through extraordinary times."
She made the revelations during a visit to a Baby Basics UK in Sheffield, South Yorkshire, on Tuesday as she launched a new initiative she has spearheaded, getting 19 major UK retailers and brands to donate more than 10,000 new items to more than 40 baby banks across the UK.
Baby Banks are a key national service, run by volunteers, helping to support some of the most vulnerable families in the UK by providing essentials such as nappies, clothing and bedding.
Most of those who seek their help come on professional referral from services including health visitors, midwives and social workers.
They have proved to be a lifeline for many struggling parents during the coronavirus crisis but have found their services under increasing pressure, both as a result of demand and because they have been unable to accept second hand donations on health and safety grounds.
Hearing of this, the duchess who has also previously visited Baby Basics in West Norfolk the start of the crisis - decided to put out feelers for donations from brands and high street retailers.
In all, Kate has persuaded nineteen brands to donate more than 10,000 items to Baby Basics, Little Village and AberNecessities, who operate more than 40 baby banks across the UK.
The duchess wearing an elegant white dress by Suzannah, with mock-crock grey heels, donned a pretty floral print mask, an apron and rubber gloves to help unpack the first donations, which included clothes and toys.
Despite her high heels, she pulled boxes from a pallet with ease and carried them inside, helping staff from Baby Basics UK which started ten years ago in Sheffield, who have teamed up with two other baby bank services, Little Village and Aberdeenshire-based AberNecessities.
Inside their distribution centre - which with the help of couriers DHL is transferring the donations as far afield as Aberdeen and Hastings - The duchess helped unpack some of the boxes, exclaiming as she picked up a bottle of Child’s Farm shampoo, which she clearly recognised.
Cat Ross, CEO of Baby Basics, told her: "Often in a world where there is a lot of judgement and stereotyping about being poor, that additional stress can be even more difficult for parents who are doing amazing things to keep their families going with such strength, such determination."
"Yes," said Kate, "one of the mums I met was a nurse. These are families who do fantastic jobs and even they are struggling.
"All of research show how vital things like this are for them and that they are being recognised."
Kate talked at length about what the impact of Covid would be, particularly for children.
"It’s difficult for sure but there is a lot of fear about worry about when furlough ends and what it means for families," said Miss Ross.
"But one of the positives to come out of it is the strength of communities across the UK and people wanting to help, volunteering and wanting to provide for each other. Organisations like us what to harvest that and it keep it going as much as possible."
"It’s been wonderful during lockdown, hasn’t it,’ said the duchess, ‘about the way everyone has been busy knitting away and actually it is those small volunteering acts that everyone can contribute to that make such a difference. That inter generational support system has been amazing. Knowing that you can make such a big difference to another family is wonderful."
Sophia Parker, Chief Executive and Founder of Little Village, agreed, adding: "We say the currency in this is kindness, this is what this is all about.
"It’s really special being able to facilitate people to support others. They are often just looking for that opportunity to do something."
The duchess added: "It’s about finding new ways of still providing people with the support they so desperately need.’
Kate then set about opening some of the boxes and chatted with the helpers about organisations they worked with to offer emotional support to families.
"Sometimes it’s just about having the opportunity of offload," she said.
"And once someone has received a basket do you often see them coming back for support in different areas?"