diff --git a/src/components/feed/MilestoneCard.tsx b/src/components/feed/MilestoneCard.tsx
new file mode 100644
index 0000000..4674f82
--- /dev/null
+++ b/src/components/feed/MilestoneCard.tsx
@@ -0,0 +1,94 @@
+"use client";
+
+import type { MilestoneType } from "@prisma/client";
+import { MILESTONE_META } from "@/lib/milestone-meta";
+import { getAvatarUrl } from "@/lib/avatar-url";
+import { getMediaUrl } from "@/lib/media-url";
+import { Avatar, AvatarFallback, AvatarImage } from "@/components/ui/avatar";
+
+type MilestoneCardPost = {
+  id: string;
+  caption: string | null;
+  createdAt: Date | string;
+  pet: { id: string; name: string; avatarKey: string | null };
+  images: { id: string; storageKey: string; position: number }[];
+  milestone: { milestoneType: MilestoneType; notes: string | null } | null;
+};
+
+interface MilestoneCardProps {
+  post: MilestoneCardPost;
+}
+
+function formatDate(date: Date | string): string {
+  return new Date(date).toLocaleDateString(undefined, {
+    year: "numeric",
+    month: "long",
+    day: "numeric",
+  });
+}
+
+/**
+ * MilestoneCard — distinct orange-tinted card for milestone posts (MILE-02).
+ *
+ * Renders: icon (32px, orange-500) + type label (text-base font-semibold orange-500)
+ * + pet name + date + optional caption/notes + optional photo.
+ * Background: bg-orange-50 border border-orange-200 per UI-SPEC accent reservation #8.
+ */
+export function MilestoneCard({ post }: MilestoneCardProps) {
+  const { pet, milestone, images, caption } = post;
+
+  if (!milestone) return null;
+
+  const meta = MILESTONE_META[milestone.milestoneType];
+  const Icon = meta.icon;
+  const avatarUrl = getAvatarUrl(pet.avatarKey);
+  const photo = images[0];
+
+  return (
+    <article className="bg-orange-50 border border-orange-200 rounded-lg overflow-hidden">
+      {/* Header */}
+      <div className="flex items-center gap-3 px-4 py-3">
+        <Avatar className="w-8 h-8 shrink-0">
+          {avatarUrl && <AvatarImage src={avatarUrl} alt={pet.name} />}
+          <AvatarFallback className="text-xs bg-orange-100 text-orange-600">
+            {pet.name[0]?.toUpperCase() ?? "?"}
+          </AvatarFallback>
+        </Avatar>
+        <div className="flex-1 min-w-0">
+          <p className="text-base font-semibold text-foreground leading-tight truncate">
+            {pet.name}
+          </p>
+          <p className="text-xs text-muted-foreground">{formatDate(post.createdAt)}</p>
+        </div>
+      </div>
+
+      {/* Milestone type badge */}
+      <div className="flex items-center gap-3 px-4 pb-3">
+        <Icon className="h-8 w-8 text-orange-500 shrink-0" aria-hidden="true" />
+        <span className="text-base font-semibold text-orange-500">{meta.label}</span>
+      </div>
+
+      {/* Optional photo */}
+      {photo && (
+        <div className="w-full">
+          {/* eslint-disable-next-line @next/next/no-img-element */}
+          <img
+            src={getMediaUrl(photo.storageKey) ?? ""}
+            alt={caption ?? `${pet.name}'s milestone`}
+            className="w-full object-cover max-h-[400px]"
+          />
+        </div>
+      )}
+
+      {/* Caption or notes */}
+      {(caption || milestone.notes) && (
+        <div className="px-4 py-3 space-y-1">
+          {caption && <p className="text-sm text-foreground">{caption}</p>}
+          {milestone.notes && (
+            <p className="text-sm text-muted-foreground italic">{milestone.notes}</p>
+          )}
+        </div>
+      )}
+    </article>
+  );
+}
diff --git a/src/components/feed/PostCard.tsx b/src/components/feed/PostCard.tsx
index 0114ea0..2bd4df0 100644
--- a/src/components/feed/PostCard.tsx
+++ b/src/components/feed/PostCard.tsx
@@ -37,6 +37,7 @@ import { Button } from "@/components/ui/button";
 import { getAvatarUrl } from "@/lib/avatar-url";
 import { getMediaUrl } from "@/lib/media-url";
 import { PawRing } from "@/components/stories/PawRing";
+import { MilestoneCard } from "@/components/feed/MilestoneCard";
 import { BlockDialog } from "@/components/safety/BlockDialog";
 import { ReportSheet } from "@/components/safety/ReportSheet";
 
@@ -67,15 +68,18 @@ type PostPet = {
   avatarKey: string | null;
 };
 
+export type PostCardPost = {
+  id: string;
+  type?: string | null;
+  caption: string | null;
+  createdAt: Date | string;
+  pet: PostPet;
+  images: PostImage[];
+  milestone: { milestoneType: import("@prisma/client").MilestoneType; notes: string | null } | null;
+};
+
 export type PostCardProps = {
-  post: {
-    id: string;
-    caption: string | null;
-    createdAt: Date | string; // tRPC serializes Date as ISO string over HTTP
-    pet: PostPet;
-    images: PostImage[];
-    milestone: unknown | null;
-  };
+  post: PostCardPost;
   /** Called after successful delete so parent can remove from list */
   onDeleted?: (postId: string) => void;
 };
@@ -180,6 +184,11 @@ export function PostCard({ post, onDeleted }: PostCardProps) {
     deleteMutation.mutate({ postId: post.id });
   }, [post.id, deleteMutation]);
 
+  // Milestone posts use their own distinct card (MILE-02)
+  if (post.type === "MILESTONE") {
+    return <MilestoneCard post={post} />;
+  }
+
   return (
     <article className="bg-card border border-border rounded-lg overflow-hidden">
       {/* Header row — 16px horizontal padding, 12px vertical */}
diff --git a/src/lib/milestone-meta.ts b/src/lib/milestone-meta.ts
new file mode 100644
index 0000000..a3818c5
--- /dev/null
+++ b/src/lib/milestone-meta.ts
@@ -0,0 +1,52 @@
+import { MilestoneType } from "@prisma/client";
+import {
+  Cake,
+  Heart,
+  Leaf,
+  Stethoscope,
+  Milk,
+  Trophy,
+  Star,
+  Award,
+  type LucideIcon,
+} from "lucide-react";
+
+export interface MilestoneMeta {
+  label: string;
+  icon: LucideIcon;
+}
+
+/**
+ * Maps every MilestoneType to a display label and Lucide icon (D-09, UI-SPEC).
+ * Used by MilestoneCard and MilestoneForm.
+ */
+export const MILESTONE_META: Record<MilestoneType, MilestoneMeta> = {
+  BIRTHDAY:        { label: "Birthday",         icon: Cake },
+  ADOPTION_DAY:    { label: "Adoption Day",      icon: Heart },
+  FIRST_OUTING:    { label: "First Outing",      icon: Leaf },
+  VET_VISIT:       { label: "Vet Visit",          icon: Stethoscope },
+  LITTER:          { label: "New Litter",         icon: Milk },
+  FOLLOWERS_500:   { label: "500 Followers",      icon: Trophy },
+  FOLLOWERS_1K:    { label: "1,000 Followers",    icon: Trophy },
+  FOLLOWERS_2_5K:  { label: "2,500 Followers",    icon: Trophy },
+  FOLLOWERS_5K:    { label: "5,000 Followers",    icon: Trophy },
+  FOLLOWERS_10K:   { label: "10,000 Followers",   icon: Star },
+  FOLLOWERS_25K:   { label: "25,000 Followers",   icon: Star },
+  FOLLOWERS_50K:   { label: "50,000 Followers",   icon: Star },
+  FOLLOWERS_100K:  { label: "100,000 Followers",  icon: Star },
+  FOLLOWERS_250K:  { label: "250,000 Followers",  icon: Award },
+  FOLLOWERS_500K:  { label: "500,000 Followers",  icon: Award },
+  FOLLOWERS_1M:    { label: "1,000,000 Followers", icon: Award },
+};
+
+/**
+ * The 5 user-initiated milestone types shown in the creation picker.
+ * Follower-threshold types are auto-triggered (D-10) and excluded from the form.
+ */
+export const USER_INITIATED_MILESTONE_TYPES = [
+  MilestoneType.BIRTHDAY,
+  MilestoneType.ADOPTION_DAY,
+  MilestoneType.FIRST_OUTING,
+  MilestoneType.VET_VISIT,
+  MilestoneType.LITTER,
+] as const;