What is the proper way using composition in Golang

I'm OOP guy, recently I have to work on Golang the language that I haven't done it before. Though I already went through many articles talking about composition, I notice it's a bit tricky to use it properly on Golang

Let's say I have two examples of Golang composition, I don't know which one will be correct, and would it be different between of them? Thank you

First example

type BaseClass struct {
   db *DB
}

func NewBaseClass(db *DB) *BaseClass {
  return &BaseClass{db}
}

type ChildrenClass1 struct {
     baseClass *BaseClass
}

func NewChildrenClass1(db *DB) *ChildrenClass1 {
  baseClass := NewBaseClass(db)
  return &ChildrenClass1{baseClass}
}

type ChildrenClass2 struct {
     baseClass *BaseClass
}

func NewChildrenClass2(db *DB) *ChildrenClass2 {
  baseClass := NewBaseClass(db)
  return &ChildrenClass2{baseClass}
}

func main(){
  db := NewDB()
  chilrend1 := NewChildrenClass1(db)
  chilrend2 := NewChildrenClass2(db)
}

Second example

type BaseClass struct {
   db *DB
}

func NewBaseClass(db *DB) *BaseClass {
  return &BaseClass{db}
}

type ChildrenClass1 struct {
     baseClass *BaseClass
}

func NewChildrenClass1(baseClass *BaseClass) *ChildrenClass1 {
  return &ChildrenClass1{baseClass}
}

type ChildrenClass2 struct {
     baseClass *BaseClass
}

func NewChildrenClass2(baseClass *BaseClass) *ChildrenClass2 {
  return &ChildrenClass2{baseClass}
}

func main(){
  db := NewDB()
  baseClass := NewBaseClass(db)
  chilrend1 := NewChildrenClass1(baseClass)
  chilrend2 := NewChildrenClass2(baseClass)
}