Mick Jagger's partner Melanie Hamrick, 29, heads out in New York to go shopping for newborn Deveraux

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Melanie Hamrick cut a casual figure on Thursday as she headed out in New York to a baby store.

She left newborn Deveraux with the babysitter as she ran the errands and made phone calls.

The mother of Mick Jagger's eighth child was joined by a friend as they walked through the city's swanky Upper West Side before heading inside Albee Baby for half an hour.

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Running errands: Mick Jagger's partner Melanie Hamrick, 29, nips out in New York to go shopping for newborn Deveraux

Melanie emerged empty-handed and was seen moments after leaving having a heated conversation on her phone.

The new mum looked casual in a black bomber jacket, skinny black jeans and loose-fitting boots.

She was sure to keep wrapped up in a thick white scarf and kept her eyes covered with some shades.

The nearly-thirty brunette kept her hair tied back for the outing and appeared to be make-up free - her flawless pale complexion glowing in the sun. 

Braving the chill: She was sure to keep wrapped up in a thick white scarf and kept her eyes covered with some shades

She's been hitting the gym in a bid to shed her pregnancy weight after welcoming her son (full name Deveraux Octavian Basil) with Mick, 73, last month.

But Melanie took time out from her hectic schedule to enjoy some peaceful bonding time with her newborn at the beach last week.

In a sweet Instagram snap, the ballerina showed off her slimmed down figure in a red and white dress as she cradled the youngster, with the sea billowing behind her.

Sweet snap: Mick Jagger's partner Melanie Hamrick, 29, flaunted her slimmed down figure in a stylish dress as she cradled her newborn son Deveraux Octavian Basil while at the beach

The American born beauty opted to go barefoot and braved a wardrobe malfunction in the patterned thigh-high split dress due to the windy conditions.

Melanie's brunette tresses were tied into a low ponytail as she kept her sweet son protectively close to her chest. 

'Rain Rain Go Away! Thinking back to my angels first beach trip ☀️,' she captioned the moody-filtered snap, which provided her with a scenic backdrop of the ocean and cliffs. 

The dancer, who gave birth to the Rolling Stones frontman's eighth child after they began dating in 2014, is also determined to get back into shape as she focuses on a return to the stage. 

Tiny dancer! The ballerina, who began dating the Rolling Stones frontman in 2014 and gave birth to his eight child last month, is determined to get back into shape as she focuses on a return to the stage

Melanie shared a snap of her after working up a sweat in the gym over the weekend.

Looking glowing after the gruelling session, she gave the camera two thumbs up as she posed for the post workout snap taken by her personal trainer.

She wrote: 'One day at a time getting back in ballet shape #ballerina #fitness #fitnessbody #ballerinabody #postbaby.'  

In another gym snap, she was dressed in black leggings and a sweatshirt which highlighted her slim figure as she flexed her bicep. 

With her hair pulled up into a ponytail and her yoga mat laid out on the gym floor, Melanie looked ready for her work out.

The beauty also shared an Instagram shot from her NYE celebrations earlier this month, which she marked by partying at a pal's wedding.

'Gym day for a baby workout!': In another gym snap, she was dressed in black leggings and a sweatshirt which highlighted her slim figure as she flexed her bicep

Party time: Melanie also shared an Instagram shot from her NYE celebrations earlier this month which she marked by partying at a pal's wedding

Perched on a window seat, the beauty shows off her long legs in a pretty black mini dress.

'Happy New Year from a NYC rooftop! Honored to ring in the new year with a #petely wedding !! #beautifulcouple #happynewyear #3weekspostpartum #postpartumbody,' she wrote.

Melanie has been documenting her first few weeks of motherhood on her social media, telling fans she's getting back into her health and fitness regime.  

Last week she shared a snap from her Cryotherapy session, with the bizarre treatment involving exposing her nude body to nitrogen gas at minus 100c temperatures for up to four minutes.   

Night on the town: Melanie also enjoyed a fun girls' night out a week ago, sharing a video as she danced with her girlfriends 

'Day one of my journey to getting the Ballet Body back! Thanks @kryolife for the Icy start! #ballerina #kryolife #balletbody #postpartumfitness #postpartumbody #fitness @abtofficial', she captioned the image.  

The week before, Melanie treated her followers to the very first snap of her baby son.

Taking to Instagram, she wrote: 'I'm so love with my baby Deveraux Jagger. Thank you @lizzyjagger for the sweet introduction.'

The picture is very similar to the one first shared with Mick's daughter Elizabeth two days ago.  

A photograph of the baby, Sir Mick's eighth child, appeared on an Instagram account under the name of Elizabeth Jagger, one of the rocker's other children.

Post-baby regime: Melanie underwent a bizarre Cryotherapy session - just three weeks after giving birth to her baby boy

'I'm so love with my baby Deveraux Jagger': Thrilled Melanie shared a snap of her newborn son with Sir Mick Jagger on Instagram

The caption read: 'My beautiful baby brother Deveraux Octavian Basil Jagger.'

The baby's full name is Deveraux Octavian Basil Jagger - Octavian means 'born eighth' in Latin.

Sir Mick and Melanie began dating after the death of fashion designer L'Wren Scott in 2014, Sir Mick's partner of 13 years.

It is understood Sir Mick flew 3,500 miles from London to New York in a last-minute dash to be by Hamrick's side for the birth.

A source told the Daily Mirror the legendary rocker said he 'needed to be there' for his partner. 

Gushing sister: Mick's daughter Elizabeth posted an almost identical first picture of the newborn boy on Instagram

Baby joy: Rolling Stones frontman Mick (right) became a father again at the age of 73. He welcomed the latest addition to his brood with Melanie (left)

The source added: 'He made sure he was there. He wouldn’t have missed it for the world.' 

Sir Mick has a daughter, Karis Hunt Jagger, 46, from his relationship with Marsha Hunt and a daughter Jade Jagger, now 45, with his ex-wife Bianca.

He had four children with his ex-partner Jerry Hall - Elizabeth, 32, James, 31, Georgia, 24, and Gabriel, 18.

He also had a son, Lucas, 17, following a brief relationship with Brazilian model Luciana Gimenez. 

Basil was the first name of Sir Mick's late father, who died in 2006, although he was known to others as Joe. 

Jumping for joy: Sir Mick is understood to have given Melanie a $150,000-a-year maintenance deal to help the ballerina raise their child

A statement released on behalf of the couple at the time of birth said: 'Melanie Hamrick and Mick Jagger's son was born today in New York and they are both delighted.

'Mick was at the hospital for the arrival. Mother and baby are doing well and we request that the media respect their privacy at this time.' 

Even though Mick and Melanie are not planning on getting married, they plan to co-parent given his hectic work schedule. 

A source told MailOnline: 'Mick wanted to make sure that the deals and money aspects were in place before Christmas and the birth of their child.

'Mick is adamant that the kid will be cared for and the deal works out at 150k a year and then housing on top of that.

Moving on: Sir Mick and Melanie (right) began dating after the suicide of fashion designer L'Wren Scott (left, with the Rolling Stones legend) in 2014, Sir Mick's partner of 13 years